Mr Nathan Seiler > Ballard Spahr LLP > Denver, United States > Lawyer Profile
Ballard Spahr LLP Offices
1800 Larimer Street, Suite 1600
Denver , CO 80202
United States
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Mr Nathan Seiler
Position
Partner
Career
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.
Memberships
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
Education
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
Lawyer Rankings
United States > M&A/corporate and commercial > M&A: middle-market (sub-$500m)
Ballard Spahr LLP handles a significant volume of middle-market M&A on behalf of both companies and private equity clients. Well weighted between buyer and seller-side mandates, the group handles deals in all key industry sectors, with a focus on the life sciences, TMT, manufacturing, financial services, energy, and consumer products industries. The M&A practice is led jointly by Philadelphia-based Brian Doerner and Minneapolis-based Barbara Rummel, both of whom are particularly recognized for their expertise in life sciences-related transactions. Nathan Seiler splits his time between Denver and Boulder and chairs the business and transactions department, where he specializes in advising high-growth companies on corporate matters. Other recommended names in Minneapolis include private equity specialist Maggie Tatton and Michael Kuhn, who acts for both companies and private equity funds. The national team also draws on Phoenix-based senior counsel Karen McConnell, who is a seasoned veteran in corporate and securities work, and Philadelphia’s Gregory Seltzer, whose practice spans M&A, venture capital and start-up matters.
Lawyer Rankings
Top Tier Firm Rankings
- Philadelphia Elite > Commercial disputes
- Minneapolis Elite > Corporate and M&A
- Minneapolis Elite > Corporate and M&A
- Seattle Elite > Corporate and M&A
- Seattle Elite > Corporate and M&A
- Philadelphia Elite > Corporate and M&A
- Finance > Financial services regulation
- Philadelphia Elite > Intellectual Property
- Philadelphia Elite > Real estate
- Finance > Project finance
- Seattle Elite > Real estate
- Philadelphia Elite > White-collar crime
Firm Rankings
- Salt Lake City Elite > Commercial disputes
- Seattle Elite > Commercial disputes
- Philadelphia Elite > Commercial disputes
- Minneapolis Elite > Corporate and M&A
- Minneapolis Elite > Corporate and M&A
- Seattle Elite > Corporate and M&A
- M&A/corporate and commercial > M&A: middle-market (sub-$500m)
- Seattle Elite > Real estate
- Philadelphia Elite > Real estate
- Philadelphia Elite > Real estate
- Real estate > Real estate investment trusts (REITs)
- Finance > Restructuring (including bankruptcy): municipal
- Philadelphia Elite > White-collar crime
- Philadelphia Elite > White-collar crime
- Los Angeles Elite > Banking and finance
- Philadelphia Elite > Banking and finance (including restructuring)
- Salt Lake City Elite > Commercial disputes
- Seattle Elite > Commercial disputes
- Portland Elite > Commercial disputes
- Portland Elite > Commercial disputes
- San Francisco Elite > Finance and restructuring
- Finance > Fintech
- Labor and employment > Labor-management relations
- Real estate > Land use/zoning
- Media, technology and telecoms > Media and entertainment: litigation
- Dispute resolution > Product liability, mass tort and class action - defense: automotive/transport
- Real estate > Real estate
- Los Angeles Elite > Real estate
- Philadelphia Elite > White-collar crime
- Labor and employment > Employee benefits, executive compensation and retirement plans: design
- Dispute resolution > Financial services litigation
- Real estate > Real estate finance
- Energy > Renewable/alternative power
- Antitrust > Civil litigation/class actions: defense
- Dispute resolution > Securities litigation: defense
- Dispute resolution > Corporate investigations and white-collar criminal defense