Was a good friend of Telly Savalas, starring with him in many television programs such as American Playhouse: My Palikari (1982) and Kojak (1973).
He is a Greek American. His parents were Greek immigrants.
He and his ex-wife, Julianna McCarthy, have two children: Thea Eileen (Thea Constantine) and Brendan Neil (Brendan Constantine).
He made guest appearances on both of the longest running prime time dramas in US television history: Gunsmoke (1955) and Law & Order (1990).
Has a variety of foreign accents at his disposal, including French, Italian and Russian.