Wall's ventures often integrate environmental and social activism. With Radio Vision International, his first media company, he distributed and produced live benefit concerts including Human Rights Now!, USA for Africa, Live Aid, and the anti-apartheid Nelson Mandela 70th Birthday Tribute. As the founder and CEO of Control Room, he executive produced Live 8, which drew a worldwide audience of a billion people, and created and executive produced Live Earth, viewed globally by an estimated two billion people. Wall co-founded Sustainable Holdings, a company which weights its holdings based on a company’s sustainability score, and is a general partner at Craton Equity Partners, a $242 million green-tech private equity fund. PTK Capital focuses on early investments in companies that offer social, environmental and educational benefits and address issues of gender equality.