elected positions

• 1988--1990; member, Fermilab Users Exectutive Committee

• 1989--1990; Chairman, Fermilab Users Exectutive Committee

• 1998--2000; member, Fermilab Users Executive Committee

• 2008-2011; vice chairperson, American Physical Society, Division of Particles and Fields

appointed positions

• 1980--1981; Co--leader (with Leon Lederman) of Arms Control and Disarmament Seminar Series
  
• 1983; member, Fermilab Computer Coordinating Committee
  
• 1988--1989; Physicist on an independent panel appointed by the Governor of Michigan to study the radiological and toxilogical effects of the SSC in Michigan.
  
• 1991; member, Search Committee for the Director of Fermilab (following the retirement of Leon Lederman)
  
• 1991--1995; member, Fermilab Program Advisory Committee
  
• 1991; member, $1^{st}$ Fermilab Neutrino Oscillation Panel advisory panel to FNAL Director)
  
• 1994; Chairman, $2^{nd}$ Fermilab Neutrino Oscillation Panel advisory panel to FNAL Director)
  
• 1991--1994; member, Los Alamos Meson Physics Facility Physics Advisory Committee
  
• 1992--1995; Special Assistant to the Fermilab Director
  
• 1994--1995; Committee on Long Term Planning, Division of Particles and Fields, APS.
  
• 1997; Member of the DOE Site visit team to the Stanford Linear Accelerator Laboratory.
  
• 1997--1998; Nominating Committee for the APS Division of Particles and Fields Panofsky Prize.
  
• 1998; Committee for Review of Academic Tenure, APS.
  
• 2001-current; Co-chair, US-European Working Group to organize LHC upgrades and VLHC activities.
  
• 2002-2005; University Representative to the DOE High Energy Advisory Panel (HEPAP).
  
• 2003; Led the University Team in the first-ever ``Committee of Visitors'' review of the DOE Office of High EnergyPhysics.
  
• 2004-5; Co-chaired a task force to evaluate the physicist resources in the U.S. for the remainder of the decade. This involved a survey of every NSF and DOE grant and every experiment HEP experiment in the world.
  
• 2005; Vice-chair, APS DPF Nominating Committee.
  
• 2006; Chair, APS DPF Nominating Committee.
  
• 2006-7; Member, DOE/NSF High Energy Physics Advisory Panel University Grants Program Subpanel, a review of boththe DOE and NSF funding agencies.
  
• 2006-7; Member of the HEPAP "Envoy Program" steering committe