[2] Singer graduated magna cum laude from Yale University, with distinction in mathematics and economics.

Three to four months prior to going to graduate school, he worked for Children's Television Workshop (the name, at that time, of the production company for the TV show "Sesame Street",[4]) and then began doing internships.

[7] After Singer graduated from Harvard, he was hired by showrunner John Wells to write for The West Wing.

[8] Singer was hired in 2013 to write a screenplay for a Leonard Bernstein biopic, but the film languished in development hell for a decade.

In 2023 he was nominated for the Academy Award for Best Original Screenplay alongside Bradley Cooper for the film Maestro.