While an undergraduate at Harvard, Thaddeus was the president of the Harvard Undergraduate Constitutional Law Society, a member of Harvard Financial Analysts Club and Harvard Ventures, and was one of three undergraduates to gain admission to and cross-register in the Harvard Business School Field X and Field Y entrepreneurship field courses.
He also served as an investment analyst intern at Sunaya Capital and Elliott Management Corporation and a business development strategist at LINK, a social media business. After graduation, Thaddeus worked at AllianceBernstein as an Equity Research Associate.