I knew from profiling him in the past that billionaire entrepreneur and Shark Tank judge Mark Cuban prefers to do interviews by email. And even though I am personally a fan of the phone interview, because I love a good follow-up question (“and how did that make you feel?”), I wasn’t going to get in the way of another busy parent getting it done. So here is what Mark Cuban said when I emailed him to ask about how parenthood had affected his thinking and his career. How old were you when you became a father, and how do you think fatherhood changed your perspective? [time-brightcove not-tgx=”true”] 45.