Walter Kortschak, a 65-year-old billionaire, is a self-made investor who has made a fortune from 40 years of technology bets. He is confident in his formula for success, which he attributes to his ability to be patient and persistent. Kortschak's assets are now worth an estimated $1.6 billion, thanks to his tenure at growth equity firm Summit Partners and his personal early-stage investments that paid off big.

Born in Canada to an Austrian father and an American mother, Kortschak had an international childhood, raised largely in Geneva, where his father worked at the Swiss outpost of chemical manufacturer DuPont. Kortschak first wanted to be a software engineer, and earned two degrees in the discipline: a bachelor's from Oregon State and a master's from Caltech. He then joined a computer graphics startup in 1982 that later became MSC Software.

Kortschak's investing career has been marked by several significant milestones. He was one of the early investors in McAfee, which went public just a year after his investment, with a 9x return for Summit. He was also involved in several other successful investments, including E-Tek Dynamics, which was sold to JDS Uniphase for $18.4 billion in 2000, and The Trade Desk, which went public in 2016 and is now valued at over $50 billion.

Kortschak's current investments focus on artificial intelligence and machine learning, with stakes in OpenAI and Anthropic, among other companies. He believes that investors need to be careful in their investing approach, as the current market conditions are not conducive to IPOs for venture-scale companies.

In a recent interview with Forbes, Kortschak cautioned against getting swept up in the "mass hysteria" of a particular sector, saying that investors need to be patient and disciplined in their approach. He also emphasized the importance of understanding the amount of capital required to bring a company to break even, and being selective in one's investments.

Kortschak's most notable investment as a strategic angel investor was in The Trade Desk, where he saw the potential for a game-changing technology that could revolutionize the advertising industry. He invested $367,000 in the company's Series A round in 2012, which valued the company at $18.75 million. The company went public in 2016 and is now valued at over $50 billion, making Kortschak's investment worth over $600 million.

Despite his many successes, Kortschak has also had his share of disappointments. He has spoken publicly about the dangers of over-capitalizing a young company, and the importance of being selective in one's investments.

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