W alter Kortschak is an American venture capitalist who made his billion-dollar fortune as a longtime managing partner at the venture capital firm, Summit Partners. An Austrian immigrant, he joined Summit Partners in 1985 and was instrumental in building the firm into a major global player in growth equity investing. Summit's strategy is to invest in profitable, fast-growing companies that are in the later stages of their development.

During his long tenure at the firm, Kortschak led a number of the firm's most successful investments, particularly in the technology and healthcare sectors. His biggest and most famous success was his early investment in the enterprise software company McAfee, a stake that generated a massive return for the firm. He has since retired from his role as a managing partner but remains a senior advisor to the firm. His vast fortune is derived from his successful career and his ownership stake in one of the world's most successful growth equity firms.