[3][5] He starred as espionage agent Glenn Garth Gregory in the 1972–1973 ABC dramatic television series, The Delphi Bureau.

He also played Lillian Hellman's lawyer Joseph L. Rauh in the television film Dash and Lilly (1999).

[3] He starred in Pavel Kohout's 1976 Broadway play Poor Murderer at the Ethel Barrymore Theatre, Michael Cristofer's The Shadow Box (1977) at the Morosco Theater, for which he received a nomination for the Best Featured Actor in a Play, and in Thomas Babe's A Prayer for My Daughter (1978) at the Public Theater.

Luckinbill has written and performed in several one-man shows, including, Hemingway, Teddy, and An Evening with Clarence Darrow.

[9] William Shatner discovered Luckinbill by chance by channel-surfing late one night and seeing him perform as Johnson.