Happy Birthday: Walter Marvin Koenig (born September 14, 1936) is an American actor and screenwriter. He began acting professionally in the mid-1960s and quickly rose to prominence for his supporting role as Ensign Pavel Chekov in Star Trek: The Original Series (1967–1969). He went on to reprise this role in all six original-cast Star Trek films, and later voiced President Anton Chekov in Star Trek: Picard (2023). He has also acted in several other series and films including Goodbye, Raggedy Ann (1971), The Questor Tapes (1974), and Babylon 5 (1993). In addition to his acting career, Koenig has made a career in writing as well and is known for working on Land of the Lost (1974), Family (1976), What Really Happened to the Class of '65? (1977) and The Powers of Matthew Star (1982).

After Chekov, Koenig had a recurring role as Psi Cop Alfred Bester (pictured above) on the television series Babylon 5. He was a "Special Guest Star" in twelve episodes and, at the end of the third season, the production company applied for an Emmy nomination on his behalf. He was slated to play Bester on the spin-off series Crusade, but the series was cancelled before his episode was filmed. The character name of "Alfred Bester" was an homage to the science-fiction writer of the same name.