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Daniel Harper Duval, Business Attorney in Washington, District of Columbia

Over 47 years of legal practice · focused on Business, IP, and M&A · 5.0/5 rating from 1 verified client review

PartneratCohen Mohr LLP

Washington, DC

Practicing business in Washington since 1979.

47+
Years practicing
5.0 ★
1 client review
3
Bar admissions

Practices in

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Quick answer

Daniel Harper Duval is a partner based in Washington, DC. The practice focuses on Business, IP, and M&A. Daniel has over 47 years of legal experience. Currently practicing at Cohen Mohr LLP. Rated 5.0 out of 5 from 1 client review.

Based in
Washington, DC
Experience
over 47 years
Known for
Business · IP · M&A
  • Handles Business, IP, and M&A matters from Washington, DC.
  • Over 47 years of practice as a licensed attorney.
  • Recognized with AV Preeminent.

About Daniel Harper Duval: Daniel Harper Duval is a partner based in Washington, DC. The practice focuses on Business, IP, and M&A. Daniel has over 47 years of legal experience. Currently practicing at Cohen Mohr LLP. Rated 5.0 out of 5 from 1 client review.

Areas of practice

Daniel's practice areas in Washington

Daniel concentrates on business, ip, and m&a. Each area below outlines the kind of case Daniel handles, typical outcomes to expect, and how the intake process starts.

Business cases in Washington, District of Columbia

Daniel takes business matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Daniel agrees to represent you.

IP cases in Washington, District of Columbia

Daniel takes ip matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Daniel agrees to represent you.

M&A cases in Washington, District of Columbia

Daniel takes m&a matters in Washington, District of Columbia. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Daniel agrees to represent you.

Biography

Daniel Harper Duval, business attorney serving Washington

Daniel Harper Duval is a partner based in Washington, DC. The practice focuses on Business, IP, and M&A. Daniel has over 47 years of legal experience. Currently practicing at Cohen Mohr LLP. Rated 5.0 out of 5 from 1 client review. Daniel works from Washington, District of Columbia and takes on business matters across the region.

Mr. Daniel Harper Duval is a lawyer practicing business, mergers & acquisitions, venture capital and 2 other areas of law. Daniel received a A.B. degree from Harvard University in 1976, and has been licensed for 47 years. Daniel practices at Cohen Mohr LLP in Washington, DC.

How Daniel handles business matters

Mr. Daniel Harper Duval is a lawyer practicing business, mergers & acquisitions, venture capital and 2 other areas of law. Daniel received a A.B. degree from Harvard University in 1976, and has been licensed for 47 years. Daniel practices at Cohen Mohr LLP in Washington, DC.

The kind of cases Daniel takes

Daniel reviews new inquiries case-by-case for business, ip, and m&a matters in Washington and the surrounding District of Columbia area.

Credentials

Credentials — where Daniel studied and practices

  • University of Virginia

    J.D. · 1979

  • Harvard University

    A.B. · 1976

Jurisdictions

Daniel's state bar admissions

  • Virginia

    1993 · ACTIVE

  • District of Columbia

    1991 · ACTIVE

  • Georgia

    1979 · ACTIVE

Daniel studied at J.D. in University of Virginia and A.B. in Harvard University.

Law school and academic background

Daniel completed J.D. in University of Virginia and A.B. in Harvard University. Formal legal training is one signal of substantive knowledge — the day-to-day practice Daniel runs in District of Columbia is where that training gets applied to real client questions.

Recognition

Daniel's legal honors and published work

Daniel has received 1 formal recognition from bar associations, industry bodies, and peer-review services.

  • AV Preeminent

Legal awards and honors

AV Preeminent.

Affiliations

Daniel's professional memberships and bar associations

  • McLean, Fairfax County and American Bar Associations

    membership

Locations

Daniel Harper Duval's office in Washington

Daniel's primary office is at Suite 504, 1055 Thomas Jefferson Street, N.W., Washington, DC, 20007. In-person meetings are by appointment; a phone intake usually comes first.

Main office

Cohen Mohr LLP

Suite 504, 1055 Thomas Jefferson Street, N.W.

Washington, DC 20007

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Client feedback

Client reviews of Daniel Harper Duval — 5.0/5 rating from 1 verified client review

Every review below is from a verified client of Daniel. Reviews cover communication, case outcome, and value — the three signals that matter most when comparing business attorneys in Washington.

5.0

1 client review

Client ratings are sourced from public records and editorial research. Reviews on LawyersListed are accepted from verified clients once Daniel Harper Duval claims this profile.

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Hiring guide

How to hire Daniel Harper Duval — what to expect in your first consultation

Working with a new business attorney should feel structured. Here's how the first two conversations with Daniel usually go, from the moment you request a consult to the day representation begins.

Consultation formats and pricing

Daniel charges for the initial consult. That fee is credited toward representation if you retain Daniel's office.

What to bring to your first meeting

Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; Daniel will tell you what matters and what doesn't.

Questions to ask a business attorney in Washington, District of Columbia

A short list to run through before you commit: How many business matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?

Fees & payment

Fees, payment methods, and consultation options for Daniel

Daniel discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in business practice — ask which fits.

Hourly rates, contingency fees, and flat-fee options

Every business matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. Daniel confirms the model in the engagement letter before any work starts.

Payment methods and payment plans

Daniel's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many business practices work with clients on structured schedules.

Frequently asked

Frequently asked questions about Daniel Harper Duval

  • How much does it cost to hire Daniel for a business case?

    Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Daniel walks through the likely range during the consult so there are no surprises.

  • Does Daniel offer a free consultation?

    Daniel charges for the initial consult; that fee is credited toward representation if you retain Daniel's office. Some business attorneys offer free consults — check Daniel's current terms during booking.

  • How long do business cases in District of Columbia typically take?

    Simple business matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. Daniel gives a realistic estimate for your facts at the consult — vague answers here are a red flag.

  • Can Daniel take my case if I'm outside Washington?

    Daniel is licensed in District of Columbia. Matters governed by District of Columbia law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Daniel will tell you if the case is a fit or refer you to someone closer to your court.

  • What should I bring to my first meeting with Daniel?

    Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. Daniel will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.

  • Is Daniel accepting new business clients right now?

    Daniel's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.

Areas served

Business attorneys serving Washington and Belize City in District of Columbia

Daniel handles business matters throughout District of Columbia. Each city below is a direct link into the search page for verified business attorneys in that community.

More counsel

If Daniel's intake is full or the fit isn't right, these business attorneys in Washington handle similar matters. Every profile below is verified and open to consultations.