Marshall told Playbill writer Harry Haun that she and Landis will wed Sept. 19 in the Hudson River Valley.
Marshall directed and choreographed the recent revivals of The Pajama Game and Wonderful Town, winning Tony Awards for her choreography for both productions.
Landis is a Tony-winning producer and photographer, who has been represented on Broadway by November, The Homecoming, The Caine Mutiny Court-Martial, The Pajama Game and Glengarry Glen Ross.