Guest/Visiting Scientist:

• 
  Max Lab - Lunds, Sweden (2000 – present).
  
  
• 
  Petersburg Nuclear Physics Institute - Gatchina, Russia (2000 – present).
  
  
• 
  Mainz Microtron Laboratory - Mainz, Germany (2000 – present).
       Steering Committee
       Crystal Ball at MAMI (2001 – present).
  
  
• 
  Brookhaven National Laboratory - Upton, NY (1994 – present)
       Crystal Ball Collaboration Executive Committee
       (1999 – present)
  
  
• 
  Continuous Electron Beam Accelerator Facility - Newport News, VA (1989 – present).
       CLAS Collaboration Coordinating Committee
       (1999 – 2001).
       JLab/CEBAF Real Photon Physics Working Group Chairman
       (1999 – 2001).
       Technical Working Group Photon Tagger Chairman
       (1992 – 1998).
  
  
• 
  Nationaal Instituut voor Kernfysica en Hoge Energiefysica - Netherlands (1982 – 1999).
  
  
• 
  Saskatchewan Linear Accelerator Laboratory - Saskatoon, Saskatchewan (1976 and 1999).
  
  
• 
  Laboratoire National Saturne - Saclay, France (1979 – 1996).
  
  
• 
  Los Alamos Meson Physics Facility - Los Alamos, NM (1978 – 1996).
       LAMPF Users Group P³ Working Group Chairman
       (1981, 83, 85).
       LANL/LAMPF Technical Advisory Panel
       (1984 86).
       LANL/LAMPF Advisory Committee for the Neutral Meson Spectrometer
       (1990-94).
  
  
• 
  Tri University Meson Physics Facility - Vancouver, BC (1978-1986).
  
  
• 
  National Bureau of Standards Linear Accelerator - Gaithersburg, MD (1974-1986).
  
  
• 
  Bates Linear Accelerator Laboratory - Middletown, Ma (1975-1985).