Dave Goldberg
Web Summit, CC BY 2.0

Sheryl Sandberg is known for her role in building Facebook into an information powerhouse and her book Lean In. But the man who was with her every step of the way was her husband, Dave Goldberg, who died unexpectedly Friday at age 47. A  successful start-up entrepreneur, Goldberg was “perhaps the signature male feminist of his era,” The New York Times says.