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Condensed Matter & Thermal Physics Group, MPA-10

DIVISION

  • MPA
    Materials Physics and Applications Division

GROUPS

  • MPA-STC
    Superconductivity Technology Center
  • MPA-NHMFL
    National Magnetic Field Laboratory
  • MPA-CINT
    Center for Integrated Nanotechnologies
  • MPA-10
    Condensed Matter & Thermal Physics
  • MPA-11
    Sensors & Electrochemical Devices
  • MPA-MC
    Materials Chemistry

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MPA-10 WEBPAGE

A brief history of the Condensed Matter and Thermal Physics Group at Los Alamos

unclassified, LA-UR-07-0454

The group known today as Condensed Matter and Thermal Physics at Los Alamos National Laboratory has a history almost as long as that of Los Alamos itself.  As our group arose out of the original Chemistry, Metallurgy Research (CMR) Division, and moved through Chemistry- Metallurgy Fowler (CMF), Physics (P), Energy (Q), back to Physics (P), then to Materials Science and Technology (MST), and most recently to Materials Physics and Applications (MPA), experimental condensed-matter science at cryogenic temperatures has remained its central technical focus, with thermodynamics a primary theme, and with additional themes of low-temperature physics and cryogenic engineering. 

Milligram quantities of plutonium first arrived at Los Alamos in late 1943, and gram amounts in early 1944, so one can imagine the thrilling pace of physical-chemistry and metallurgical investigations of plutonium and some of its alloys in 1944 and early 1945, driven simultaneously by the unbelievable excitement of learning about a completely new element and by the urgent need to deliver the “pit” for Trinity, the first nuclear explosion. 

After the end of World War II, many opportunities for fundamental science arose hand in hand with the ongoing development of nuclear weapons.  The earliest members of our group initially teamed up to determine the properties of plutonium with high precision, recognizing that measurements of some of its properties at cryogenic temperatures were essential for developing an understanding of this very unusual metal as well as for accessing the practical issue of the thermal stability of properties below room temperature.  These very early studies included isothermal compressibility, sound velocity, and thermal conductivity measurements that later were extended to electrical resistivity and specific heat.  Thus the Metals Physics group was born at Los Alamos in 1945. 

Figure 1.  This sign has been hanging above the front door of our building for as long as we can remember.  (Note: da Vinci was not a member of our group.)

Our group’s cutting-edge fundamental science and practical support for the mission of Los Alamos Scientific Laboratory expanded in the late 1940s with a new applied focus:  the so-called “Super,” using a fission trigger to unleash the energy of fusion of light nuclei.  It was known that deuterons fuse much more easily than protons and that a high initial density of deuterons was advantageous, so it was obvious that research on the fundamental properties of cryogenic liquid deuterium would be needed, as well as engineering research into the separation and purification of the hydrogen isotopes and the liquefaction, storage, and transport of deuterium.  Tritium—the radioactive isotope of hydrogen—was also of interest.  In 1948, our group was renamed Low Temperature Physics and Cryoengineering, and undertook a systematic scientific and engineering study of the low-temperature thermodynamic and transport properties of all the helium and hydrogen isotopes.  This fundamental work was punctuated by the “Mike” shot at Eniwetok atoll, using liquid deuterium fuel and producing a thermonuclear yield of roughly 10 megatons of TNT.  (See Figure 2.)  

Figure 2. Mike, the first large-scale experiment with thermonuclear fusion. 1952. Photo courtesy of National Nuclear Security Administration / Nevada Site Office.

The record shows that many group members of that era somehow accomplished both fundamental research and meaningful participation in Mike and other south-Pacific weapons tests.  When our group’s new building, shown in Figure 3, was opened in the mid 1950s, the street in front was named Eniwetok in memory of those intense years of work.  Although cryogenic liquid deuterium was soon replaced by room-temperature solid lithium deuteride as the fuel for thermonuclear weapons, the extensive low-temperature science and engineering associated with Mike underpinned other important future developments ranging from the use of liquid hydrogen as space-shuttle fuel through the development of standards for safe handling of large quantities of cryogenic liquids to the physics of superfluid helium. 

To appreciate the scientific excitement of low-temperature physics in this era, one should remember that helium superfluidity was not discovered until 1937-38 and the two-fluid model of superfluidity was not established until the late 1940s.  As had been the case with plutonium a few years earlier, with 3He our group took advantage of the unique opportunity to explore the properties of an entirely new material, motivated by and enabled by applied work.  The natural abundance of 3He is tiny, but thermonuclear weapons production established a new, industrial-scale production of tritium, which decays with a 12-year half-life into 3He, giving our group the first access to this fascinating and complex solid and liquid.  Our group accomplished the historic initial liquefaction of 3He in 1948 and performed measurements of its thermodynamic and transport properties throughout the 1950s. Remember, too, that this was an era when most research equipment was still built by technicians — not bought from companies — and experiments were still done by people — not by computers.  Each cryostat and its associated plumbing were individually designed and carefully built.  Data acquisition rates and accuracy were usually limited by how well group members could read mercury manometers, analog galvanometers, and optical levers with linear scales, and how quickly and accurately they could write the numbers in their lab books.  Temperatures were held constant by homemade rubber-membrane manostats regulating the pressure in pumped helium baths, or in rare, sophisticated circumstances by homemade electronic feedback circuits using vacuum tubes.  Data analysis relied mostly on pencils, paper, and slide rules.  (Later, a lab book might occasionally be taken to the ladies whose job it was to transcribe data onto IBM punch cards for processing at the central computing facility.)  Secretarial skill was measured by the number of typing errors per page of technical manuscript, a number that was often far smaller than one, despite staff member handwriting that made the distinctions between words like “monatomic” and “monotonic” a matter of judgment for the typist.

Figure 3. The buildings that still hold most of our group, as they appeared in 1957 when the only other nearby buildings were the CMR building (left), the administration building (background), and the steam plant (right background). SM32 (known then as the Cryogenic Engineering Laboratory) and SM34 (known then as the Low Temperature Physics Laboratory) had a much higher ratio of lab space to office space than is typical in today’s new construction. Parts of the sawtooth roof on the east end of SM32 were deliberately weak — potential sacrifices, to save the rest of the building in case of explosion during the years that they housed hydrogen liquefaction equipment.

By the mid 1960s, the “Low Temperature Group” included 10 physicists, 9 physical chemists, 7 technicians, 5 chemical engineers, 4 machinists, 2 mechanical engineers, 2 secretaries, 2 postdocs, and 1 electrical engineer.  Already, a tremendous breadth of interests in low-temperature physics was evident:  Scientific studies underway included equation of state and thermal properties of the helium isotopes, neutron diffraction studies of solidified gases, superfluid hydrodynamics, superconductivity, Mossbauer studies of lattice dynamics and magnetism, the Kondo effect, and nuclear physics with cryogenic polarized targets.  Cryogenic engineering research and development in that era included measurement of transport properties of helium and hydrogen liquids, the design and construction of several superconducting magnets and radio-frequency cavities for use elsewhere at Los Alamos, and solid hydrogen and deuterium target development for the Los Alamos Meson Physics Facility.  At the interface between low-temperature physics and cryogenic engineering, our group had the first working 3He-4He dilution refrigerator in the US, thanks to the technician who assembled it perfectly leak-free on his first attempt;  and one of our early dilution refrigerators stayed cold for three months, which was a remarkable accomplishment at that time.

In the 1970s, a new national need gained attention, and our group responded again with a combination of fundamental research and technology development.  The 1973 OPEC oil embargo triggered the widespread realization that US energy sources were being depleted and imported energy was undependable;  furthermore, acid rain and other pollution were problematic.  Many group members naturally carried their low-temperature-physics and cryogenic-engineering talents into energy R&D.  Fundamental work included research on flux motion, losses, and pinning in Type II superconductors, dielectric breakdown at cryogenic temperatures, properties of A15 superconductors (e.g., Nb3Ge), and the stability of superconductor/normal-metal composites, while applied efforts included the development of dc and ac superconducting power transmission lines, superconducting magnetic energy storage for electric utilities, a car fueled by cryogenic hydrogen, and cryogenic distillation purification of hydrogen isotopes for fusion-energy fuel.  Federal support for such energy R&D dropped abruptly in the early 1980s, but many of these developments are receiving renewed attention today, and significant spin-offs from that era of our group, such as the Los Alamos Tritium Systems Test Assembly, now have significant histories of their own.

Figure 4. Our group’s machine shop has changed little through many decades, until the present era of numerically controlled machines. Under microscopic examination, the calendar on the left in this photo displays January 1964, and the floor in the foreground is littered with doughnut crumbs — evidence that our traditional celebration of the exceptional work our group’s technicians goes back at least 43 years.

In the late 1970s and early 1980s, the study of thermodynamic cycles and processes, and the relevant properties of materials used in them, began with an effort in magnetic refrigeration and later included engines and refrigerators using liquids near their critical points.  Advances in magnetic refrigeration quickly took that team out of our group and into industry.  3He–4He mixtures below 1 Kelvin proved to be ideal for studying the fundamentals of yet another type of thermodynamic process:  spinodal decomposition of supersaturated phase transitions.  Another aspect of our group’s focus on cycles and processes, the development of the fundamentals and applications of thermoacoustic engines, refrigerators, and (later) mixture separators, began in 1981 with the invention of the thermoacoustic refrigerator in our group.  In the 1990s, the thermodynamic-cycles and -processes focus grew further to include the invention and development of tiny hollow, spherical, cryogenic deuterium­–tritium shells for inertial-confinement fusion targets, an effort which soon matured and moved out of our group.

The early to middle 1980s was a transitional period for fundamental research in our group, refocusing on more-fundamental problems in fluid dynamics and on strongly correlated f-electron phenomena.  Appropriate to this change in fundamental focus and to the continuation of thermodynamic-cycle and -process research, our group’s name was changed to Condensed Matter and Thermal Physics.  Correlated-electron phenomena, fundamentals of fluid dynamics, and thermoacoustics remain central research themes of our group today. 
The fluid-dynamics focus of the 1980s included an experimental program in chaos, pattern formation, and turbulence, which continues today.  Still based in part on low-temperature techniques, the fluids focus also served as an incubator for a cryogenic neutrino-mass experiment based on spin-polarized hydrogen in the 1980s.  In the 1990s, the fluids focus expanded to include the study of lead-bismuth mixtures and other liquids, and their interactions with steels, of interest in advanced nuclear reactors and the accelerator transmutation of nuclear waste;  and the thermoacoustics team began the development of thermoacoustics for industrial-scale liquefaction of natural gas.

The research focus on correlated-electron materials, their growth as single crystals, and earlier experience with applications of superconductors positioned our group to respond immediately to the 1986 discovery of high-temperature superconductivity.  As in many other laboratories around the world, this discovery marked a sea change in our group and triggered the expansion of experimental capabilities necessary to explore and understand this surprising phenomenon.  By the end of the 1980s, these capabilities included electronic transport, thermodynamics, heat transport, and nuclear-magnetic and muon-spin resonance.  Los Alamos, like the rest of the nation, saw high-temperature superconductivity as an opportunity to reinvigorate energy-related research, and formed the Superconducting Technology Center from a nucleus of group members to develop applications of this discovery.  Fundamental research on strongly correlated electron physics, including f-electron and cuprate materials, remained in our group and provided a basis for Los Alamos to collaborate with the state of Florida in establishing the new National High Magnetic Field Laboratory.  With our group’s interests in the physics of correlated materials at extremes of low temperatures and high pressures, it was natural for the newly created Los Alamos Pulsed Field Facility to find its home in our group until 1998, when the Magnet Lab was spun off as a separate Laboratory Center. 

During the 1990s, our group also diversified into ultra-fast optics (which opened new windows for investigating correlated-electron materials but also impacted weapons diagnostics), started an effort in magnetic resonance force microscopy, and added neutron scattering and photoemission to its growing repertoire of materials-characterization techniques.  These years laid the foundation for the 2002 discovery in our group of the first plutonium-based superconductor, a direct result of our earlier work on related heavy-fermion superconductors and magnets.  With this discovery and with photoemission research, part of our group returned to its roots in the study of plutonium.  Despite its continuing relevance to the Los Alamos’s mission, relatively little progress had been made on fundamental understanding of the “plutonium problem” during the previous six decades, but superconductivity in the new plutonium compound opened entirely new avenues for investigation and engaged the international condensed-matter community in plutonium for the first time.

click here for June 1999 Group Reunion photo

Summarizing the activities of hundreds of people over the course of 60 years in such a short note is a matter of brutal down-selection.  Many precious memories are unrecorded here;  entire lines of research whose stories could each occupy many pages have been completely omitted.  Nevertheless, we hope this short note communicates the pride that we feel for the history of our group, for its responsiveness to the applied needs and the scientific frontiers in each decade of its existence, and for its enduring commitment to technical excellence.

Greg Swift and Joe Thompson, 2006

(We gratefully acknowledge documents and stories from Ed Hammel, Dean Taylor, Jim Hoffer, and Marty Maley.)

MPA-10 FACTS

Group Leaders
  • 1945-1970 Ed Hammel (Ph.D. physical chemistry, Princeton, 1944)
  • 1970-1985 Bill Keller (Ph.D. physical chemistry, Harvard, 1948)
  • 1985-1992 Bob Heffner (Ph.D. physics, Washington, 1973)
  • 1992-2001 Joe Thompson (Ph.D. physics, Cincinnati, 1975)
  • 2001-2002 Art Ramirez (Ph.D. physics, Yale, 1984)
  • 2002-2006 John Sarrao (Ph.D. physics, UCLA, 1993)
  • 2006- Mike Hundley (Ph.D. physics, Berkeley, 1988)
APS Fellows
    Al Arko
    Larry Campbell
    Greg Dash
    Bob Ecke
    Zach Fisk
    Chris Hammel
    Ed Hammel
    Bob Heffner
    Bill Keller
    Marty Maley
    Al Migliori
    Roman Movshovich
    Bill Overton
    Art Ramirez
    John Sarrao
    Adam Schuch
    Bill Steyert
    Greg Swift
    Toni Taylor
    Joe Thompson
    John Wheatley
Laboratory Fellows*
    Al Arko
    Bob Ecke
    Zach Fisk
    Chris Hammel
    Al Migliori
    Bob Mills
    Roman Movshovich
    Greg Swift
    Joe Thompson
    *Los Alamos Fellows established in 1981
Present staff members
    Scott Backhaus (p)
    Wei Bao
    Eric Bauer (p)
    Nick Curro (p)
    Tomasz Durakiewicz (p)
    David Gardner
    Mike Hundley (p)
    John Joyce (p)
    Jackie Kiplinger (p)
    Ning Li (p)
    Roman Movshovich (p)
    Mike Rivera (p)
    Filip Ronning (p)
    Greg Swift (p)
    Joe Thompson (p)
    (p) indicates former postdoc
Former staff members
    (Date ranges are years in our group; Los Alamos presence may be longer.)
    Al Arko
    Rick Averitt
    Bill Ball
    John Barclay
    Roger Bartlett
    John Bartlit '62-'80
    Phil Bendt '56-'72
    Hans Bevens '45-'48
    Heinrich Boenig
    John Bronson
    Larry Campbell (p) '67-'80 & '95-'98
    Dick Carlson (p)
    Prit Choudhuri
    Jack Conant
    Paul Craig
    Tim Darling (p)
    Greg Dash '51-'60
    John Dean '74-'79
    Bob Ecke (p)
    Fred Edeskuty '50-??
    Anatoly Efimov (p)
    ?? Faveuff
    Zach Fisk (s)
    Tim Gosnell
    Ed Grilly '47-'80
    Chris Hammel (p)
    Ed Hammel '45-'70
    Bill Hassenzahl
    Bob Heffner (p)
    Mike Henke
    Jim Hoffer '70-'01(p)
    Charlie Hoffman
    Chester Hwang
    Chou Yen Huang
    Il-Kyoung Jeong (p)
    Kamal Khallafala
    Bill Keller, '50-'85
    Gene Kerr
    Tsuyoshi Kimura (p)
    Tom Kitchens (p)
    George Kwei
    Alex Lacerda (p)
    Henry Laquer '47-'77
    Don Liebenberg
    Don Lester
    Jim Lindsay
    Earl Long
    Marty Maley (p) '65-'67 & '74-'89
    Tom McDonald
    Albert Migliori (p)
    Bob Mills
    Gil Miranda
    Jan Novak '60-'70
    Bill Overton
    Denis Pelekhov (p)
    Cal Potts
    Art Ramirez
    Jeff Roberts
    Tom Roberts
    George Rodriguez (p)
    John Rogers '51-'92
    Ray Rylander
    Tom Sandenaw
    John Sarrao (s)
    Dave Schiferl (p)
    Adam Schuch '49-??
    Al Sesonske
    Bob Sherman
    Bob Shermer
    Henry Sommers
    Walt Stewart
    Bill Steyert
    Bob Stokes
    John Sullivan
    Steve Sydoriak '48-'80
    Dean Taylor '54-'90
    Toni Taylor
    Joe Tesmer
    Walt Trela
    John Wheatley '81-'86
    Ken Williamson
    Walt Willis '60-??
    Jeff Willis (p)
    Mahlon Wilson '65-'67
    Stefan Wipf
Technicians and machinists
    present
    Carmen Espinoza
    Kevin Graham
    Warren Pierce
    Roy Rockage
    Mike Torrez
    Todd Womack

    former
    Bob Aiken
    John Bailey
    Thom Bell
    Marcus Bennett
    Johnathan Betts
    Art Briesmeister
    Dick Briesmeister
    Bob Candler
    Don Clinton
    Bob Chrisman
    Bob Cole
    Yates Coulter
    Sam Cunningham
    Glen Dill
    Jack Dyson
    Albert Eisensee
    Chris Espinoza
    Caleb Evans
    Harry Ficht
    Stretch Fretwell
    Eleutario Garcia
    Guadalupe Garcia
    Barney Geelan '51-'83
    Ron Haggard
    Dean Harkleroad
    Clarence Harmer
    Doug Hatch
    Jim Harlow '48-'78
    Harvey Haagenstad
    Joe Hand
    Bob Johns
    Joe King
    Epolito Lopez
    Mike McClannahan
    Willard McCormick
    Quinn McCulloch
    Jimmy Martinez
    Joe Martinez
    Robert Martinez
    Candido Maestas
    Eldon Murley (?)
    Bob Oziemski
    Tim Pierce
    Ernesto Romero
    Jen Roper
    Ray Rylander
    Leander Salzer
    Paul Saunier
    Leroy Schmidt
    Bob Stokes
    James Taylor '63-'81
    Ike Valdez
    Sherman Vernon
    Jimmy Wade
    Gerry Weeks
    Bill Yeamons
Secretaries and admins
    present
    Juanita Armijo

    former
    Judy Ackerhalt
    Maxine Beckmann
    Peg Bivins
    Virginia Brennan
    Michelle Brewer
    Judi Briesmeister, '74-'76
    Sylvia Charmatz
    Betsy Coca
    Mary Curfman
    Adeline Damiano
    Stephanie Davis
    Gin Desjardin
    Judy Gallegos
    Julie Gallegos
    Claire Gillis
    Helen Hansen
    Carol Harkleroad
    Eunice Kern
    Melanie Maestas
    Vicky Maestas
    Manuelita Mtz-Brito
    Lou Miller
    Shirley Montoya
    Nancy Morrison
    Pam Rockage
    Norma Stibbard
    Nissa Strottman
Post docs and students
    ("s" indicates student)

    present
    Mahesh Bandi
    Tod Caldwell
    Jun Chen
    John Clark (s)
    Peter Hoseman
    Tomasz Klimczuk
    Han-Oh Lee
    Evgueni Nazaretski
    Tuson Park
    Eric Schelter
    Yoshi Tokiwa
    Mike Twardos
    Ricardo Urbano

    former
    Clint Ackerman
    Jason Alexander (s)
    Ballard Andrews
    Meigan Aronson
    Marie Aronsson
    Melanie Asaki (s)
    Fedor Balakirev
    Marty Banton
    Ward Beyermann
    Simon Billinge
    Robert Blyth
    Corwin Booth
    Hortencio Borges
    Tamas Borzsonyi
    Steve Boyd (s)
    J. Boyer
    Tim Braje (s)
    Theresa Brandman (s)
    John Brisson
    Stuart Brown
    Scott Buchanan
    Lou Bucholtz
    Francesca Calgaro
    Keith Carroll
    Paul Canfield
    Bill Challener
    Houtang Chen
    Sang Cheong (s)
    Elbert Chia
    H. Coburn
    Andy Cornelius
    Gary Cort
    Zahir Daya
    Giovanni Donati (s)
    Peter Ebey
    Matt Eisaman (s)
    John Engelhardt
    Dennis Erickson
    Arshang Fartash (s)
    Franz Freibert
    Jim Fraser
    Veronika Fritsch
    Andy Fusco
    Brian Gamble (s)
    Elke Gampers (s)
    Jason Gardner
    Drew Geller
    Tom Graf
    Chunlei Guo
    Ela Guziewicz
    (Dave?) Haensch
    Mike Hayden
    Hans Haucke (s)
    Kaden Hazzard (s)
    Helmut Hegger
    Jerry Helfrich (s)
    Jeff Hill
    Bob Hiller
    David Hilton
    Daniela Hristova (s)
    Tom Hofler (s)
    Yuchou Hu
    Namjung Hur
    Randy Jacobs (s)
    Marcelo Jaime
    Kimberly Jantunen (s)
    Del Jones
    Ki-Yong Kim
    Yongmin Kim
    Padma Kodali
    Vince Kotsubo
    Ken Krane
    Raymond Kwok (s)
    Lianping Le
    Hae Ja Lee
    Ming Lei
    Jason Leonard (s)
    Rich LeSar
    Jon Levine (s)
    K.C. Lim
    Ana Lima
    Scott List
    Yuanming Liu
    Anna Llobet
    Ahmed Lobad
    Despo Louca
    Mary Lowe
    McLean Machut
    Yoshi Maeno (s)
    David Mandrus
    Joe Martindale
    Janine Martinez (s)
    Karlene Maskaly (s)
    Joe Matthews (s)
    Konstantin Matveev
    Pat Maxton (s)
    Mike McHenry
    Chuck Mielke
    Robert Modler
    David Moore
    Greg Moore
    Mark Moores (s)
    Evangelia Moshopoulou
    Karl Mueller
    Carl Mungan
    John Neumeier
    Michael Nicklas
    Fenglei Niu
    John Norvell
    John O'Hara
    Jeff Olson
    Fiorenzo Omenetto
    Willie Padilla
    Pascoal Pagliuso
    Cedomir Petrovic (s)
    Long Pham (s)
    Rohit Prasankumar
    Bill Pratt
    Andrea Prodi (s)
    Dave Reagor
    Bob Reid (s)
    Erin Rericha (s)
    Arneil Reyes
    Brandon Rohrer
    Larry Schwalbe
    John Shier
    Shoou-Shinn Shiah (s)
    Craig Siders
    Jenifer Siders
    Barb Simovic
    Dipen Sinha
    Jim Sites
    Bart Smith
    Mike Smith
    Jin So
    Jeff Sonier
    Guenter Sparn
    Phil Spoor
    Andrew Stockham (s)
    Thor Stromberg
    Byong Jin Suh
    Tim Sullivan
    Andreas Suter
    Verner Thorsmolle
    Rod Thurston
    Peter Vorobieff
    Bill Ward
    Atsu Watanabe (s)
    Dzmitry Yarotski (s)
    Balakishore Yellampalle
    Yohsuke Yoshinari
    Ben-Li Young
    Huidan Yu
    Zhenyong Zhang
    Fang Zhong
    E. Zirngiebl
    Bob Ziff
    Carl Zimm
Long-term visitors
    (visiting staff members, consultants, collaborators)

    present
    Tim Darling
    Leticie Ferreira
    Zach Fisk
    Bob Heffner
    Jon Lawrence
    Moshe Pasternak
    Vladimir Sidorov
    Dean Taylor

    former
    whose names do not appear elsewhere
    Bernie Abraham
    Paul Barrett
    Jacob Bigeleisen
    Ferdinand Brickwedde
    Bob Brout
    Ludwig Bruch
    John Clem
    Eddie Cohen
    Michael Cohen
    Heikke Collan
    John Daunt
    Daniel Decker
    Mel Daybell
    Yehiel Disatnik
    Dick Etters
    Henry Fairbank
    Hans Frauenfelder
    Louis Goldstein
    Lenny Gruenberg
    George Gruner
    Bob Hake
    A. Hildebrandt
    Dieter Hochheimer
    Col. Hutchinson
    Elisha Huggins
    Hubert James
    Henry Kierstead
    John Kilpatrick
    Myra Kilpatrick
    Matti Krusius
    Sig Larsen
    Elliott Leib
    Bob Leisure
    Doug MacLaughlin
    Dillon Mapother
    Darrell Osborne
    Hans Ott
    Ron Parks
    C. B. Pierce
    Philippe Pruzan
    John Raich
    Roger Shaw
    John Sheliak
    Sergei Stishov
    Masashi Takigawa
    Hirofumi Wada
    Bernie Weinstock
    Gene Wells

 

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