Jeff's new boyfriend, Greg, who is closeted from his own homophobic father, finds it difficult to relate to Harry's well-meaning matchmaking ways.
The play, directed by Kevin Dowling, opened on October 16, 1990 at the Off-Broadway Cherry Lane Theatre, where it ran for 335 performances.
Produced by Christine Harris and HIT Productions, the cast includes one of Australia's most well-known television, theatre and film actors John Jarratt, alongside Patrick Harvey, Glenn van Oosterom, and Nell Feeney.
A 1994 Australian film adaptation also titled The Sum of Us was directed by Dowling and Geoff Burton and starred Russell Crowe and Jack Thompson.
The screen adaptation mimics the play's device of breaking the fourth wall with direct to camera conversational asides by both Harry and Jeff.