This mentoring was critical for me because I went on to set up my own design studio.

FORBES: Biz Stone on His Biggest Challenges, Influences and the Future of Social Media

Elizabeth diGiacomantonio recently parted ways with the co-founder of her three-year-old business, Walk Up Press, a letterpress and design studio in Brooklyn, N.

WSJ: Splitting With Your Company's Co-Founder Is a Tricky Task