Organizations:

American Theatre Organ Society
Organ Historical Society
Eastman Rochester Organ Initiative
Pipedreams (Radio Program)
Theatre Historical Society of America
American Guild of Organists
Cinema Organ Society

Related Companies:

Theatre Organ Restoration
Allen Organ Company
Walker Organ Company
Hauptwerk Software
Key Media Productions

Theatre Organists:

Nathan Avakian
Ken Double
Jelani Eddington
Chris Elliott
Joel Gary
Mark Herman
Donnie Rankin
Ron Rhode
Walt Strony
Brett Valliant
Clark Wilson

Other Theatre Organ Groups:

Alabama Chapter, ATOS
Atlanta Chapter, ATOS
Central Indiana Chapter, ATOS
Central Ohio Theatre Organ Society
Columbia River Theatre Organ Society
Dairyland Theatre Organ Society
Detroit Theatre Organ Society
Dickinson Theatre Organ Society (Delaware)
EMCATOS, ATOS (Easter Massachusetts)
Garden State Theatre Organ Society
Joliet Area Theatre Organ Enthusiasts
Los Angeles Theatre Organ Society, ATOS
Motor City Theatre Organ Society (Detroit)
New York Theatre Organ Society
NorCal, ATOS (Bay Area, Northern California)
Ohio Valley Chapter, ATOS
Orange County Theatre Organ Society, ATOS
Oregon Chapter, ATOS
River City Theatre Organ Society (Omaha, NE)
Rochester Theatre Organ Society
Sierra Chapter, ATOS
St. Louis Theatre Organ Society
Theatre Organ Society of San Diego
Toledo Theatre Organ Society
Valley of the Sun, ATOS (Phoenix)
Western Reserve Theatre Organ Society (Cleveland Area)
Wichita Theatre Organ, Inc.