The work, directed by Sam Gold, centers on four young writers who are participating in a private seminar taught by Leonard, a brilliant but unpredictable literary legend.
Long will be replacing Hamish Linklater in the role of Martin. Goldblum is taking over from Alan Rickman as Leonard. Additional casting will be announced at a later date.
Long's film and television credits include He's Just Not That Into You, The Break Up, Live Free or Die Hard, Dodgeball, Ed, and Galaxy Quest. Stage credits include three summers at Williamstown Theatre Festival.