Republican National Committee, 1981-present

Candidate, United States House of Representatives, Texas, District 19, 2016

Candidate, United States House of Representatives, District 19, 2014

Candidate, United States House of Representatives, Texas, District 19, 2003

Charter Member, Republican National Committee, 1981

Member, Lubbock Economics Council

Courtesy Medical Staff, Covenant Health System (Saint Mary's and Methodist Hospitals), 1991-present

Liaison, Vatican Exhibition Foundation, 2001-2002

Professor, Texas Tech College of Business Administration, 1993-2001

Professor, Texas Tech Department of Ophthalmology and Visual Sciences, 1989-2001

Active Medical Staff, University Medical Center, 1989-2001

Associate Dean for Special Projects, Texas Tech University Health Sciences Center, 1994-1996

Chairman, Department of Ophthalmology and Visual Sciences, Texas Tech, 1989-1994

Consultant, Veterans Administration Medical Center, 1989-1993

Major, United States Air Force Medical Corps, 1977-1979

Medical Corps Reserve, United States Air Force, 1973-1977

Board of Directors, World Eye Foundation, 1982-present

Member, American Academy of Ophthalmology

Member, American Association for the Advancement of Science

Member, American College of Surgeons

Member, American Farm Bureau Federation

Member, American Legion Post #575

Member, American Medical Association

Charter Member, Association for Research in Vision and Ophthalmological Society

Member, Christian Medical Society

Member, Christian Ophthalmology Society

Lubbock, Crosby, Garza County Medical Society

The Military Officers Association of America, Greater Lubbock Chapter

Member, Lubbock Round Table

Member, Ranching Heritage Museum Association

Member, Research to Prevent Blindness

Member, Schepens International Society

Member, Southern Medical Association

Member, Texas Farm Bureau

Member, Texas Medical Association

Sigma Xi, Texas Tech Chapter

Member, Texas Tech University Foundation

Member, The Club Jules Gonin

Member, The Pan-American Association of Ophthalmology

Member, The Retina Society

Member, The Society of Medical Consultants to the Armed Forces

Member, The Turkish American Ophthalmic Society

Charter Member, The Vitreous Society

Member, University of Illinois Alumni Association

Member, West Texas Museum Association

Member, Western Retina Study Club

Steering Committee, Southern Retina Study Group, 1987-1989