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Mark W. Tanner, Class Action Attorney in Philadelphia, Pennsylvania

Over 36 years of legal practice · focused on Class Action, Medical Malpractice, and Personal Injury

Philadelphia, PA

Practicing class action in Philadelphia since 1990.

36+
Years practicing
2
Bar admissions

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Quick answer

Mark W. Tanner is an attorney based in Philadelphia, PENNSYLVANIA. The practice focuses on Class Action, Medical Malpractice, and Personal Injury. Mark has over 36 years of legal experience.

Based in
Philadelphia, PENNSYLVANIA
Experience
over 36 years
Known for
Class Action · Medical Malpractice · Personal Injury
  • Handles Class Action, Medical Malpractice, and Personal Injury matters from Philadelphia, PENNSYLVANIA.
  • Over 36 years of practice as a licensed attorney.
  • Recognized with Lawyer of the Year — Mass Tort Litigation / Class Actions - Plaintiffs (Philadelphia) (2025).

About Mark W. Tanner: Mark W. Tanner is an attorney based in Philadelphia, PENNSYLVANIA. The practice focuses on Class Action, Medical Malpractice, and Personal Injury. Mark has over 36 years of legal experience.

Areas of practice

Mark's practice areas in Philadelphia

Mark concentrates on class action, medical malpractice, personal injury, and product liability. Each area below outlines the kind of case Mark handles, typical outcomes to expect, and how the intake process starts.

Class Action cases in Philadelphia, Pennsylvania

Mark takes class action matters in Philadelphia, Pennsylvania. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Mark agrees to represent you.

Medical Malpractice cases in Philadelphia, Pennsylvania

Mark takes medical malpractice matters in Philadelphia, Pennsylvania. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Mark agrees to represent you.

Personal Injury cases in Philadelphia, Pennsylvania

Mark takes personal injury matters in Philadelphia, Pennsylvania. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Mark agrees to represent you.

Product Liability cases in Philadelphia, Pennsylvania

Mark takes product liability matters in Philadelphia, Pennsylvania. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Mark agrees to represent you.

Biography

Mark W. Tanner, class action attorney serving Philadelphia

Mark W. Tanner is an attorney based in Philadelphia, PENNSYLVANIA. The practice focuses on Class Action, Medical Malpractice, and Personal Injury. Mark has over 36 years of legal experience. Mark works from Philadelphia, Pennsylvania and takes on class action matters across the region.

Mark W. Tanner primarily represents victims of medical negligence and insurance bad faith, and also has substantial experience in cases involving disability insurance claims, civil rights claims, and class action litigation. An accomplished Philadelphia Personal Injury lawyer with a wide ranging practice, Mark has handled cases throughout the region and across the country, and has been appointed as a liaison counsel in mass tort litigation at both the state and federal court level. He has secured a $22.4 million verdict for the victim of a negligently executed spine surgery, one of the largest medical malpractice verdicts in Pennsylvania. Mark also secured a $7.9 million verdict, believed to be the largest jury verdict in Pennsylvania against an insurance company in a case alleging bad faith.

Mark has been recognized for seven consecutive years as one of the Top 10 Super Lawyers in Pennsylvania by Thomson Reuters. He is the former president of The Philadelphia Trial Lawyers Association (2007-2008) and the 2005 recipient of its President’s Award. In addition, Mark has been named by The National Trial Lawyers as a Top 100 Trial Attorney in the Civil Plaintiff category and in 2016 was appointed as a hearing committee member serving the disciplinary board of the Supreme Court of Pennsylvania. In recognition of his success at trial, Mark was also one of the youngest attorneys ever invited to become a fellow of the prestigious International Academy of Trial Lawyers (membership limited to 500 lawyers).

In additional to maintaining a robust practice, Mark is a passionate pro bono activist, representing underprivileged and neglected children as a child advocate for the non-profit Support Center for Child Advocates, where he has also served on the board of directors. As a frequent lecturer, Mark has participated in more than 50 continuing legal education programs, and has taught trial advocacy, among other subjects, to law students and graduate LL.M. students at local area law schools. He has lectured throughout the United States and, by invitation, to barristers in London.

When not in court, Mark enjoys traveling, hunting, fishing, and scuba diving, and he constantly struggles with his golf game.

Mark earned a B.A. in English Literature from the College of the Holy Cross, and his J.D. cum laude from Temple University Beasley School of Law. He is licensed to practice in Pennsylvania, the U.S. District Court for the Eastern District of Pennsylvania, the U.S. District Court for the Middle District of Pennsylvania, the U.S. Court of Appeals for the Third Circuit, and the Supreme Court of the United States.

Working with Mark on a class action matter

Mark W. Tanner primarily represents victims of medical negligence and insurance bad faith, and also has substantial experience in cases involving disability insurance claims, civil rights claims, and class action litigation. An accomplished Philadelphia Personal Injury lawyer with a wide ranging practice, Mark has handled cases throughout the region and across the country, and has been appointed…

Who Mark represents

Mark reviews new inquiries case-by-case for class action, medical malpractice, and personal injury matters in Philadelphia and the surrounding Pennsylvania area.

Credentials

Credentials — where Mark studied and practices

  • Temple University

    J.D. · 1990

Jurisdictions

Mark's state bar admissions

  • United States, Admit

    ACTIVE

  • Pennsylvania, Pennsy

    1990 · ACTIVE

Mark studied at J.D. in Temple University.

Law school and academic background

Mark completed J.D. in Temple University. Formal legal training is one signal of substantive knowledge — the day-to-day practice Mark runs in Pennsylvania is where that training gets applied to real client questions.

Recognition

Mark's legal honors and published work

Mark has received 12 formal recognitions from bar associations, industry bodies, and peer-review services.

  • Lawyer of the Year — Mass Tort Litigation / Class Actions - Plaintiffs (Philadelphia)

    2025

  • Lawyer of the Year — Mass Tort Litigation / Class Actions - Plaintiffs (Philadelphia)

    2023

  • Lawyer of the Year — Mass Tort Litigation / Class Actions - Plaintiffs (Philadelphia)

    2018

  • Best Lawyers in America — Mass Tort Litigation / Class Actions - Plaintiffs

    2026

  • Best Lawyers in America — Medical Malpractice Law - Plaintiffs

    2026

  • Best Lawyers in America — Personal Injury Litigation - Plaintiffs

    2026

  • Best Lawyers in America — Awards:

    2026

  • Best Lawyers in America — Top 10 Super Lawyer in Pennsylvania, 2007 – 2017

    2026

  • Best Lawyers in America — Eddie Ohlbaum Distinguished Advocate for Children Award - Support Center for Child Advocates, 2016

    2026

  • Best Lawyers in America — Fellow - International Academy of Trial Lawyers , 2006

    2026

  • Best Lawyers in America — President’s Award - Philadelphia Trial Lawyers Association, 2005

    2026

  • Best Lawyers in America — Fellow - American Bar Foundation

    2026

Legal awards and honors

Lawyer of the Year — Mass Tort Litigation / Class Actions - Plaintiffs (Philadelphia) (2025). Lawyer of the Year — Mass Tort Litigation / Class Actions - Plaintiffs (Philadelphia) (2023). Lawyer of the Year — Mass Tort Litigation / Class Actions - Plaintiffs (Philadelphia) (2018). Best Lawyers in America — Mass Tort Litigation / Class Actions - Plaintiffs (2026). Best Lawyers in America — Medical Malpractice Law - Plaintiffs (2026). Best Lawyers in America — Personal Injury Litigation - Plaintiffs (2026).

Locations

Mark W. Tanner's office in Philadelphia

Mark's primary office is at 1845 Walnut Street, 21st Floor, Philadelphia, Pennsylvania, 19103. In-person meetings are by appointment; a phone intake usually comes first.

Main office

1845 Walnut Street, 21st Floor

Philadelphia, Pennsylvania 19103

Open in Google Maps

Client feedback

Client reviews of Mark W. Tanner

Mark has not yet collected verified client reviews on LawyersListed. Reviews here are all from confirmed clients; anonymous ratings are moderated out.

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Hiring guide

How to hire Mark W. Tanner — what to expect in your first consultation

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

Consultation formats and pricing

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

Questions to ask a class action attorney in Philadelphia, Pennsylvania

A short list to run through before you commit: How many class action 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 Mark

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

Hourly rates, contingency fees, and flat-fee options

Every class action 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. Mark confirms the model in the engagement letter before any work starts.

Payment methods and payment plans

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

Frequently asked

Frequently asked questions about Mark W. Tanner

  • How much does it cost to hire Mark for a class action case?

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

  • Does Mark offer a free consultation?

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

  • How long do class action cases in Pennsylvania typically take?

    Simple class action 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. Mark gives a realistic estimate for your facts at the consult — vague answers here are a red flag.

  • Can Mark take my case if I'm outside Philadelphia?

    Mark is licensed in Pennsylvania. Matters governed by Pennsylvania law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Mark 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 Mark?

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

  • Is Mark accepting new class action clients right now?

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

Areas served

Class Action attorneys serving Philadelphia, Pittsburgh and Harrisburg in Pennsylvania

Mark handles class action matters throughout Pennsylvania. Each city below is a direct link into the search page for verified class action attorneys in that community.

More counsel

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