3 minutes with Geoffrey Greif on male bonding

Men have “must,” “trust,” “just” and “rust” friends, said Geoffrey Greif, author of “The Buddy System” and a professor at the University of Maryland School of Social Work.

Greif turned more than 520 in-depth interviews with men and women into a 272-page discussion on what friendship means to men, what makes those friendships work, and how men can build friendships that will help them live longer, happier lives.