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Diane M Sullivan, Appellate Attorney in Washington, District of Columbia

Over 56 years of legal practice · focused on Appellate, Employment, and Litigation · 5.0/5 rating from 1 verified client review

Asst. U.S. Atty.

Washington, DC

Practicing appellate in Washington since 1970.

56+
Years practicing
5.0 ★
1 client review
1
Bar admission

Are you Diane M Sullivan?

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Quick answer

Diane M Sullivan is an asst. u.s. atty. based in Washington, DC. The practice focuses on Appellate, Employment, and Litigation. Diane has over 56 years of legal experience. Rated 5.0 out of 5 from 1 client review.

Based in
Washington, DC
Experience
over 56 years
Known for
Appellate · Employment · Litigation
  • Handles Appellate, Employment, and Litigation matters from Washington, DC.
  • Over 56 years of practice as a licensed attorney.
  • Recognized with AV Preeminent.

About Diane M Sullivan: Diane M Sullivan is an asst. u.s. atty. based in Washington, DC. The practice focuses on Appellate, Employment, and Litigation. Diane has over 56 years of legal experience. Rated 5.0 out of 5 from 1 client review.

Areas of practice

Legal matters Diane takes on

Diane concentrates on appellate, employment, litigation, and personal injury. Each area below outlines the kind of case Diane handles, typical outcomes to expect, and how the intake process starts.

Appellate cases in Washington, District of Columbia

Diane takes appellate 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 Diane agrees to represent you.

Employment cases in Washington, District of Columbia

Diane takes employment 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 Diane agrees to represent you.

Litigation cases in Washington, District of Columbia

Diane takes litigation 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 Diane agrees to represent you.

Personal Injury cases in Washington, District of Columbia

Diane takes personal injury 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 Diane agrees to represent you.

Biography

Meet Diane M Sullivan — appellate lawyer in Washington

Diane M Sullivan is an asst. u.s. atty. based in Washington, DC. The practice focuses on Appellate, Employment, and Litigation. Diane has over 56 years of legal experience. Rated 5.0 out of 5 from 1 client review.

Diane M Sullivan is a lawyer practicing litigation, federal trial law, appellate practice and 2 other areas of law. Diane received a A.B. degree from George Washington University, and has been licensed for 56 years. Diane practices in Washington, DC.

How Diane handles appellate matters

Diane M Sullivan is a lawyer practicing litigation, federal trial law, appellate practice and 2 other areas of law. Diane received a A.B. degree from George Washington University, and has been licensed for 56 years. Diane practices in Washington, DC.

The kind of cases Diane takes

Diane reviews new inquiries case-by-case for appellate, employment, and litigation matters in Washington and the surrounding District of Columbia area.

Credentials

Education, bar admissions, and languages

  • George Washington University J.D.

  • George Washington University A.B.

Jurisdictions

Diane's state bar admissions

  • District of Columbia

    1970 · ACTIVE

Diane studied at — in George Washington University J.D. and — in George Washington University A.B..

Law school and academic background

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

Recognition

Recognition and thought leadership

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

  • AV Preeminent

Legal awards and honors

AV Preeminent.

Locations

Diane M Sullivan's office in Washington

Diane's primary office is at 555 4th St., N.W., Washington, DC, 20001-2733. In-person meetings are by appointment; a phone intake usually comes first.

Main office

555 4th St., N.W.

Washington, DC 20001-2733

Open in Google Maps

Client feedback

Client reviews of Diane M Sullivan — 5.0/5 rating from 1 verified client review

Every review below is from a verified client of Diane. Reviews cover communication, case outcome, and value — the three signals that matter most when comparing appellate 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 Diane M Sullivan claims this profile.

Read all reviews

Hiring guide

How to hire Diane M Sullivan — what to expect in your first consultation

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

Consultation formats and pricing

Diane charges for the initial consult. That fee is credited toward representation if you retain Diane'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; Diane will tell you what matters and what doesn't.

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

A short list to run through before you commit: How many appellate 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 Diane

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

Hourly rates, contingency fees, and flat-fee options

Every appellate 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. Diane confirms the model in the engagement letter before any work starts.

Payment methods and payment plans

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

Frequently asked

Frequently asked questions about Diane M Sullivan

  • How much does it cost to hire Diane for a appellate case?

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

  • Does Diane offer a free consultation?

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

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

    Simple appellate 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. Diane gives a realistic estimate for your facts at the consult — vague answers here are a red flag.

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

    Diane 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 — Diane 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 Diane?

    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. Diane will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.

  • Is Diane accepting new appellate clients right now?

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

Areas served

Appellate attorneys serving Washington and Belize City in District of Columbia

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

More counsel

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