In addition, he had two pairs of mentors while he was a writer and producer in television — Ron Austin and Jim Buchanan, as well as William Link and Richard Levinson.
His television credits as a scriptwriter include Charlie's Angels, Quincy, M.E., Cagney & Lacey, The Edge of Night (Head Writer), Snoops, Another World, and Star Trek: The Next Generation.
As the new head writer of The Edge of Night in 1983, he changed the soap opera to a faster pace, with shorter timelines for crime mystery plots and more storylines within the half-hour show.
[3] Sheldon said he was brought on to Star Trek: The Next Generation as a producer in 1990 to add more mystery and action to the fourth season.
[9] He previously taught as an associate professor in the communication and media department and as co-director of the Games and Simulation Arts and Sciences program at the Rensselaer Polytechnic Institute in Troy, New York.