András Hegedűs B. (1930–2001) had a twofold role in the history of OHA. He was one of its two founders and main interviewers and he had also been an active participant in the revolution, with whom detailed interviews were done to record his testimony. In the spring of 1956, economist and sociologist Hegedűs B. became one of the secretaries of the Petőfi Circle, and in the autumn he became an activist of the Revolutionary Committee of Hungarian Intellectuals. Two interviews with him are found in the holdings of OHA, one recorded in 1985 and another one in 1992–1993. The total typed transcripts of these interviews are almost two-million characters long.