Bitten by the acting bug early in his youth, Koenig studied at the Neighborhood Playhouse in New York where he worked with fellow students James Caan, Elizabeth Ashley, and Dabney Coleman. His stage career spans 30 years and includes stops in New York, Chicago, Los Angeles and many other cities. He appeared in many plays and television shows of the late 1950's and early 1960's, including the Mr. Novak series, and even produced and wrote his own feature film in 1967, I Wish I May. In 1967 he landed the role of Ensign Pavel Chekov in the original Star Trek series.

Koenig has also appeared as Chekov in the first seven of the big screen Star Trek films and currently has a recurring role as Alfred Bester in the TV series Babylon 5. Aside from his role in Star Trek, he has appeared in 40 different TV series and television movies, including Anthony and Cleopatra starring Timothy Dalton and Lynn Redgrave.

A natural writer, Koenig has written for the television shows Family, Matthew Starr, Land of the Lost, Class of '65 and others. His first book, Chekov's Enterprise, which recounts the making of the first Star Trek movie, was published in 1979. He has also written a satiric fantasy novel, Buck Alice and the Actor-Robot, and a three-part comic book series entitled Raver. Koenig wrote and performed a one-character piece entitled You're Never Alone When You're A Schizophrenic, which was a finalist in the 1996 New York Film Festival Awards.

In a 1997 internet poll of favorite television bad guys, Koenig was the top choice of 12, 000 voters for his role as Alfred Bester on "Babylon 5." He was also voted the favorite guest star on "Babylon 5."

Koenig and his wife Judy Levitt have two children and live in Los Angeles.

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