Ballard Spahr LLP

Partner

Nathan E. Seiler is the Chair of Ballard Spahr's Business and Transactions Department, former Managing Partner of Ballard Spahr's Boulder office, a member of the Emerging Companies and Venture Capital Group, and a member of the firm's Senior Leadership Team.

Nathan advises high-growth companies on corporate and securities transactions, including initial formation, venture capital and private equity financings, mergers and acquisitions, public and private securities offerings, securities law disclosure and compliance, and general corporate counseling. He works with clients in a variety of industries, including software, biotechnology, medical device, information technology, telecommunications, natural and organic products, clean technologies, and renewable energy.

Nathan also represents acquirers and targets in a variety of public, public-private, and private-private business combination transactions as well as issuers in public and private securities offerings. In addition, he represents venture capital firms in various corporate and securities transactional matters.

Nathan helps his clients’ management and boards of directors shape and execute their business strategies. Drawing on his extensive experience, he provides counsel on legal issues ranging from day-to-day corporate and regulatory matters to corporate governance and other strategic initiatives.

Professional Activities

American Bar Association

Colorado Bar Association

Colorado BioScience Association

Colorado Cleantech Industries Association

Naturally Boulder

Rocky Mountain Venture Capital Association

Recognition & Accomplishments

Chambers USA, Corporate/M&A (Colorado), 2023-2025

Legal 500, Real Estate - Real Estate Investment Trusts (REITs), 2023; M&A/Corporate and Commercial - M&A: Middle-Market (sub-$500m), 2025

Leadership Boulder County Program 2009

Board Memberships & Community Service

Director, Impact on Education, 2019-present

Former Director, Colorado Cleantech Industries Association Foundation, Inc., 2012-2014

Former Director, Temple Grandin School, 2011-2014

Northwestern University School of Law (J.D., cum laude, 2000) Order of the Coif Articles Editor, Northwestern University Law Review

University of Nebraska-Lincoln (B.A. 1997, with honors) Phi Beta Kappa University of Nebraska Regents Scholar

Admissions

Colorado