The woman on the left is the actress Maureen O’Sullivan, who played Jane in several Tarzan movies, and went on to a long career in the industry. The taller woman is a lesser-known actress named Ann Morriss, who was about 5’9″. The actresses were working on a 1938 film called Spring Madness.
Wadlow was about nine feel tall when he died at 22. He wore a size 37 shoe (some sources say 39), and weighed 481 pounds at his highest point. He is the tallest known human in history, and was still growing when he died.