Marius Nacht is an Israeli-American serial entrepreneur, venture capitalist, investor, and engineer born in 1962. He co-founded Check Point Software Technologies Ltd. in 1993 alongside Gil Shwed and Shlomo Kramer, playing a key role in developing the company's pioneering firewall software that established it as a global leader in cybersecurity. Nacht served as Chief Technology Officer, later as Executive Vice President of Research and Development, and also as Vice President of Products during the early years, contributing significantly to the technical foundations and product strategy of the company. Under his leadership, Check Point went public on NASDAQ in 1996, becoming one of Israel's most successful tech exports and solidifying Nacht's reputation in the cybersecurity sector. He later transitioned to Vice Chairman of the Board, a position he held until resigning in 2018.

Following his departure from Check Point, Nacht shifted focus to venture capital and investing in Israel's tech ecosystem, investing in numerous Israeli and international tech startups through various funds, personal interests, and roles at various startups and funds, often providing both capital and strategic guidance. His investments span software, cybersecurity, and related technologies, leveraging his deep engineering background and industry connections. He is also the founder of other tech ventures, such as Radware. Recognized as a prominent figure in Israel's vibrant tech ecosystem, often dubbed 'Startup Nation,' Nacht's career exemplifies the innovative spirit driving the country's high-tech industry. He maintains strong ties to the cybersecurity and software sectors, leveraging his expertise to mentor and fund emerging technologies.

Nacht holds a B.Sc. in Computer Science from the Technion – Israel Institute of Technology, earned in 1984, which laid the groundwork for his technical expertise, and he has a background in Unit 8200's elite tech training programs. As a secular Jewish Israeli, he embodies the innovative spirit of Israel's tech community, with strong professional and personal ties to fellow co-founders like Gil Shwed, whom he has known since university days. While based primarily in Israel, his American nationality reflects broader international engagements in the tech ecosystem. Nacht's influence extends through board positions and advisory roles, though he maintains a relatively low public profile outside of business achievements.