Born in Harrison, New Jersey, he is best known for his work as story editor of the third season of the original series of Star Trek.
According to a letter to Isaac Asimov on May 7, 1968, Roddenberry stated that he had hired Singer based on his previous work for “Studio One, US Steel Hour, and many other fine shows.”[2] These were both anthology shows, not series.
Fontana told how Singer, early on, entered the set of the Transporter Room, and asked, “How does this thing work?” During their rewriting of "The Enterprise Incident", written by Fontana, Singer was directed by Freiberger to script a love scene for Spock and the Romulan Commander which involved kisses and embraces.
Fontana objected strongly (as did Leonard Nimoy), going over Freiberger's head to Roddenberry, who ordered the offending scene revised.
However, by midway through the season, Singer had grasped the concept and the characters, and many of his rewrites, especially those of new writers, brought the scripts more in line with the established parameters.