Derek Handley is a social entrepreneur, philanthropist and author who recently launched Aera, a venture capital fund that invests in companies with a social mission. He co-founded Hyperfactory in 2001 and was the founding CEO of the B Team, a nonprofit leadership initiative created by Richard Branson. Handley also recently served as a Nazarian Wharton Social Innovator in Residence. In this Knowledge at Wharton interview, he spoke with Katherine Klein, a Wharton management professor and vice dean of the Wharton Social Impact Initiative, on the importance of vision and what it takes to make a difference. An edited transcript of the conversation follows: Katherine Klein: How did you find your purpose as a businessperson? Derek Handley: I think the common pattern for me has been whenever something really terrible has happened, from a business or a life perspective, I ask bigger questions around what I might be best put here to do.…