Strasberg had been a castmate of Tone's in "Green Grow the Lilacs.
Zatem je postal ustanovni član slavne skupine Group Theatre, v kateri je sodeloval s Haroldom Clurmanom, Cheryl Crawford, Leejem Strasbergom, Stello Adler, Cliffordom Odetsom in mnogimi drugimi, s katerimi je sodeloval že v Theatre Guildu.