(written from a Production point of view)
Gary Pillar (born 1946), also occasionally known under his birth name of Gary Carpenter, was an actor from the early 1960s through the early 1980s. He played the role of Yutan in the Star Trek: The Original Series second season episode "A Private Little War".
He got his start on the soap opera Guiding Light before moving on to Another World (as the same character). He also appeared as a guest star in S.W.A.T., and as a regular in both Bright Promise and General Hospital.