Buck has been a national leader in venture capital for more than 25 years, investing professionally and personally in growth companies in industries that have been significantly impacted by technology.

His investing career began at Safeguard Scientifics, where he was Vice President of Acquisitions. He then went on to cofound ICG in 1996 and ran the company as Chairman and CEO for more than 20 years.

In 2020, he cofounded SEMCAP with Cyrus Vandrevala, where he is the Cofounder and Co-CIO. SEMCAP is a growth impact platform investing in companies at the forefront of seminal trends in the healthcare, education, and food & nutrition sectors.

Buck is a director of a number of high growth technology startups including Diagnostic Biochips, Dropps, Happy Being and Margaux. He serves on the Board of Directors for Philadelphia based FS Investments, a $34+ billion asset manager. He is on the advisory boards of the Carolina Entrepreneurial Initiative, the UNC Kenan–Flagler Business School, the Starfinder Foundation, and the Vetri Foundation.

Buck is passionate about early American history. SEMCAP is based in Wayne, Pennsylvania, bordering Valley Forge National Historical Park. An avid runner, Buck frequents the park and developed a deep appreciation for the events that occurred there over 250 years ago.

Buck founded Primary Source Media as a vehicle to explore the stories of our nation’s founding, with a focus on the leadership and character of our nation’s founders.

Buckley resides in Wayne, Pennsylvania with his wife Susan. They have two adult children, Alexa Buckley, co-founder of women's footwear company Margaux, and Dutch Buckley, co-founder of Happy Being. Early American History and the founding of the country is an important passion, and Buckley is currently working on a documentary film.