Sam Ziegler

Partner

Based in the firm’s Denver office, Sam advises startups and venture investors — and as an active angel investor, he brings a founder-and-funder perspective to every engagement.

For Founders
Sam helps founders navigate the full startup journey: formation, fundraising (SAFEs, convertible notes, and priced rounds), hiring, customer and vendor agreements, IP protection, and regulatory issues. He’s available for the pivotal moments — closing a Series A, structuring a strategic partnership — and for the day-to-day legal and business questions that come up in between. His background in private equity M&A at Kirkland & Ellis, where he was on teams facilitating nine-figure exits, means he can help you think about the endgame from day one.

For Investors
Sam’s investor-side work is informed by his own experience as an angel investor. His investment themes center on robotics, defense tech, aerospace, and AI, with many current seed investments sourced through YC and Harvard Business School. He’s always open to meeting founders wherever they’re starting out.

Background
Before joining Founders Law, Sam practiced private equity M&A at Kirkland & Ellis in Chicago, then at a Chicago boutique focused on M&A of smaller companies, including startups. That range — from hundred-million-dollar exits to early-stage deals — shapes the practical, business-minded counsel he provides today.

Sam is also an educator. He currently mentors founders in the Field X/Y course at Harvard Business School and guest lectures at the University of Colorado Law School. Previously, he taught Business Law as an adjunct professor through Western Colorado University and guest lectured at the University of Denver.

Sam earned his JD from the George Washington University Law School, his BA in Political Science from the University of Wisconsin–Madison, and a Masters in Curriculum and Instruction from the University of Denver. While in law school, he published research on U.S. investment in Chinese companies that has since been cited in reports to Congress and institutional investor publications.

Sam lives in Golden with his wife and three young children. His favorite place in Colorado is the slopes of Beaver Creek — he loves nothing more than skiing with his kids.

Insights & Articles

April 7, 2026
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For founders and early-stage companies, a national championship moment like this is not just a sports story. It is a commercial event. If you are building a brand, launching a product, or thinking about your first NIL partnership, there are real legal and business lessons buried in the confetti.
March 30, 2026
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When founders start the process of raising a priced round, there are fundamental business decisions that need to be made before negotiations start in earnest. The first decision will lead the headlines: the valuation of the company used in the priced round.