Bio: Ivan Earl Sinclair (b. February 19, 1937, Dimmitt, Castro County, Texas), staff assistant for Lyndon B. Johnson. He attended Hardin-Simmons University and Columbia University Graduate School of Journalism, and worked as a newspaper reporter in Amarillo, Texas before joining the United States Army. Sinclair began working for Johnson in 1962, first as an Assistant for Correspondence answering public opinion mail, and later as a staff assistant doing advance work for trips.
Ivan Sinclair, Pres. Lyndon Baines Johnson, Oval Office, 6/10/1967. Photo # c5656-17a by Yoichi Okamoto. White House Photo Office collection, LBJ Presidential Library, public domain.
LBJ Connection: Assistant to LBJ, 1962-1965. Answered public opinion mail.
Sinclair, Ivan Earl, 1937,
Biographical info page,
LBJ Presidential Library,
accessed January 23, 2019,