Henry C. Thumann
About Henry C. Thumann
Henry C. Thumann is a lawyer based in Washington, DC and has been recognized in The Best Lawyers in America® since 1989. Henry C. Thumann is recognized in the following practice area:
- Washington, District of Columbia
- Commercial Litigation
Current Firm: O'Melveny & Myers
Education: Harvard University, LL.B., Magna Cum Laude, graduated 1960 and University of Illinois - Chicago, B.S. , graduated 1957
Location: Washington, DC
It takes just a few minutes to optimize your profile for clients looking to engage and lawyers who are ready to refer.
Activate your profile and highlight why your peers recognized in Best Lawyers today.
Nearby Lawyers
Mary Jane Alves is a partner in Cassidy Levy Kent’s Washington, DC office. Her practice focuses on antidumping, countervailing duty, and safeguard enforcement and compliance. Her experience in unfair trade cases spans a range of industries, such as agriculture, chemicals, electronics, pharmaceutical, energy, textiles, carbon and stainless steel, other metals and minerals, and manufactured goods. Before returning to private practice, Ms. Alves worked for 17 years at the U.S. Internationa...
Jennifer S. Joffe is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Jennifer S., who practices law in Fairfax, Virginia, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jennifer S. is held by other top lawyers in the same geographic and legal practice area.
Alex Heidt is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Alex, who practices law in Fairfax, Virginia, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Alex is held by other top lawyers in the same geographic and legal practice area.
Area of Emphasis Julie Domike is a shareholder in the Environmental, Litigation, and Transportation Technology and Energy groups of Babst Calland. Ms. Domike serves clients who rely on her experience in environmental law, particularly regulatory issues arising under the Clean Air Act. These clients value and respect her knowledge of the regulations, her understanding of complex manufacturing and production processes, and her dedication to helping companies map the appropriate path forward to ...
Since 1993, Teresa Cole has been a practicing family law attorney handling complex divorce cases, custody determinations, and all other domestic law matters. Based on her experience and proven track record, she has been appointed as a Neutral Case Evaluator for Fairfax County, Virginia. In this role, she provides case evaluations and non-binding arbitration services for other divorce attorneys. In addition, Ms. Cole was appointed to the Divorce and Family Law Attorney Resource Panel as an adv...
Michael S. McNamara is a top attorney recognized by Best Lawyers in the practice area(s) of Construction Law. Michael S., who practices law in Washington, District of Columbia, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael S. is held by other top lawyers in the same geographic and legal practice area.
Mark’s background includes a broad array of multijurisdictional and complex commercial disputes, including class action litigation. He has practiced before state and federal courts, as well as in arbitration actions, and he has been involved in all aspects of litigation—from pretrial discovery and motion practice to trial advocacy and appellate practice. He regularly represents plans, their sponsors, and insurance companies before federal and state regulatory agencies. As a litiga...
Brian Benczkowski is a partner in Kirkland’s Washington, D.C., office. He is a member of the Firm’s Government, Regulatory & Internal Investigations Practice Group. Brian has deep and diverse government enforcement and investigations experience, bolstered by his service in multiple leadership positions at the United States Department of Justice (DOJ) and on Capitol Hill. From 2018–2020, he served as the Senate-confirmed Assistant Attorney General for DOJ’s Criminal...
Whether they are buying, selling or financing businesses, CEOs, business owners, and investors turn to Aaron Ghais to get deals done. Aaron specializes in representing mid-market companies that aspire to grow through acquisitions, and also helps business owners maximize value when they sell their companies. Clients benefit from his ability to lead them successfully through the M&A process using his creative problem-solving skills, well-honed business sense, and results-oriented style. A f...
Harry L. Gutman is a top attorney recognized by Best Lawyers in the practice area(s) of Government Relations Practice and Tax Law. Harry L., who practices law in Washington, District of Columbia, has been recognized since 1997. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Harry L. is held by other top lawyers in the same geographic and legal practice area.
Explore and Learn
The Family Law Loophole That Lets Sex Offenders Parent Kids
by Bryan Driscoll
Is the state's surrogacy framework putting children at risk?
Unenforceable HOA Rules: What Homeowners Can Do About Illegal HOA Actions
by Bryan Driscoll
Not every HOA rule is legal. Learn how to recognize and fight unenforceable HOA rules that overstep the law.
Best Lawyers 2026: Discover the Honorees in Brazil, Mexico, Portugal, South Africa and Spain
by Jamilla Tabbara
A growing international network of recognized legal professionals.
Holiday Pay Explained: Federal Rules and Employer Policies
by Bryan Driscoll
Understand how paid holidays work, when employers must follow their policies and when legal guidance may be necessary.
Can a Green Card Be Revoked?
by Bryan Driscoll
Revocation requires a legal basis, notice and the chance to respond before status can be taken away.
New Texas Family Laws Transform Navigating Divorce, Custody
by Bryan Driscoll
Reforms are sweeping, philosophically distinct and designed to change the way families operate.
US Tariff Uncertainty Throws Canada Into Legal Purgatory
by Bryan Driscoll
The message is clear: There is no returning to pre-2025 normalcy.
How Far Back Can the IRS Audit You?
by Bryan Driscoll
Clear answers on IRS statutes of limitations, recordkeeping and what to do if you are under review.
The 2026 Best Lawyers Awards in Chile, Colombia and Puerto Rico
by Jamilla Tabbara
The region’s most highly regarded lawyers.
Can You File Bankruptcy on Credit Cards
by Bryan Driscoll
Understanding your options for relief from overwhelming debt.