Bart Conrad
Bart Conrad  was a retired US Army colonel, actor and writer who played the role of Krasnovsky in the  first season episode . He filmed his scenes on Monday , Wednesday , on Friday  and Monday  at Desilu Stage 9 and Stage 10.

His body work included appearances in motion pictures for Columbia, MGM, and 20th Century Fox. For his early work, such as the film The Young Lions (1958), his military experience earned him a position as technical advisor, for which he was credited as Lt. Col. Allison A. Conrad. Following his retirement from the Army in late 1958, he began using the stage name, Bart. 

He had also portrayed a chauffeur in the motion picture  (1966) with Nichelle Nichols, Ken Lynch, Charles Seel, and Jean Simmons. His television work included appearances on , starring Ray Walston, and in several episodes of  (which he also previously served as technical advisor for under his given name). 

During the 1970s Conrad was a member of the board of directors and later vice president of the Show Business Shrine Club (aka Shriner's Club) in Van Nuys, CA, as well as a chairman or board member of several Southern California religious organizations.

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Performers
TOS performers