Walter Marvin Koenig ( ; born September 14 , 1936 ) is an American actor , writer , teacher and director , known for his roles as Pavel Chekov in '' '' and Alfred Bester in the `` Babylon 5 '' series .
Walter Marvin Koenig ( ; born September 14 , 1936 ) is an American actor , writer , teacher and director . He is known for his roles as Pavel Chekov in '' '' and Alfred Bester in `` Babylon 5 '' .