Christopher Reeve, once a Williamstown Theatre Festival apprentice and later a frequently-featured actor there, told an interviewer: "By staying here thirty years, Nikos [did] what they couldn't do in Brooklyn or Washington or at Lincoln Center" about Nikos' work at the theater (where he mentored his associates and assistant directors).
In mid-1968, at age fifteen, Reeve was accepted as an apprentice at the Williamstown Theatre Festival in Williamstown, Massachusetts. Christopher Reeve, once a WTF apprentice and later a frequently-featured actor at the festival, told an interviewer: "By staying here thirty years, Nikos [did] what they couldn't do in Brooklyn or Washington or at Lincoln Center. He mentored his associates and assistant directors, such as Tom Brennan, Arvin Brown, Keith Fowler, Peter H. Hunt, Paul Weidner, and Austin Pendleton. Nikos Psacharopoulos, a professor at Yale Drama School and a co-founder, became the executive artistic director and guided the company for over thirty years. 
