Zohar Zisapel (1949-2023) was a prominent Israeli entrepreneur, businessman, industrialist, and philanthropist, best known for co-founding the RAD Group of high-tech companies with his brother Yehuda Zisapel in 1979. The RAD Group, headquartered in Tel Aviv, specializes in networking, telecommunications, cybersecurity, and data communications technologies, growing into one of Israel's largest and most influential tech conglomerates. Under Zisapel's leadership, the group expanded globally, innovating in areas like remote access servers and broadband solutions, and played a pivotal role in establishing Israel as a leading 'Start-Up Nation' in the high-tech sector. He served as chairman and key executive in several subsidiaries, including RAD Data Communications, driving the company's success through strategic investments and technological advancements. Zisapel's business career was marked by a focus on fostering innovation and entrepreneurship in Israel. Alongside his brother, he built a family-oriented enterprise that emphasized R&D and international partnerships, contributing to the employment of thousands and significant economic impact. As a philanthropist, Zisapel supported educational initiatives, technological research, and community programs, reflecting his commitment to giving back to Israeli society. His professional relationship with Yehuda was both collaborative and familial, as siblings who shared a vision for tech innovation. Zohar Zisapel passed away on May 20, 2023, leaving an enduring legacy in Israel's high-tech industry. His contributions continue to influence networking and cybersecurity sectors worldwide, and he is remembered as a foundational figure in the country's entrepreneurial ecosystem.