About Mark

Biography

I'm a courtroom attorney with extensive civil litigation experience. I fight for what's right.

Practice Areas

Libel and Slander 26%

26%

Employment and Labor 24%

24%

Medical Malpractice 20%

20%

Personal Injury 20%

20%

Wrongful Termination 10%

10%

Fees and Rates

We have not found any cost information for this lawyer

Contact for Details

Licenses

Licensed in Pennsylvania for 38 years

State: Pennsylvania

Acquired: 1987

Active

No misconduct found

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Location

DiOrio & Sereni, LLP

(610) 891-0652

Fax

21 West Front Street, (Corner of Front and Plum Streets), Media, PA, 19063

markaserenilaw.com

Message Get Directions

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Online Presence

Other places you can find Mark online.

Mark A. Sereni's Reviews

Avvo Review Score

5.0 /5.0

54 Client Reviews

Showing 1 - 5 of 11 reviews | Employment & Labor

Posted by Liz | October 21, 2025 | Employment & Labor

Strategic & Sharp Legal Team with a Human-Centered Approach

From the moment I walked into Diorio & Sernini, LLP, the team demonstrated professionalism, compassion, and—most importantly—action. I was faced with a time-sensitive employment matter leading into a business holiday, and Diorio & Sernini was the only firm to respond promptly and clearly. After re...ceiving no response from other firms recommended to me, I stopped by in person. Jennifer, who was the only staff member in the office late that day, immediately showed empathy and initiative—making copies of my documents and beginning the consultation process on the spot. Within two business days, I had a scheduled consultation, ensuring I could meet my critical timeline. Every person I interacted with at the firm embodied a human-centered approach to their work. Mark was comprehensive in his review, honest and transparent in evaluating my position, and clear in outlining my legal options. His approach combined strong legal expertise with a genuine understanding of the personal and family stressors that accompany employment transitions. When I made my decision based on his counsel, Mark remained readily available for additional questions and clarifications as I navigated the process. I highly recommend Mark and his team to anyone seeking sharp, strategic, and sensible legal support that balances the best legal outcomes with human understanding. They are true advocates—knowledgeable, responsive, and deeply empathetic.

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Posted by anonymous | March 29, 2017 | Hired Attorney | Employment & Labor

Employment

I retained Mark Sereni to represent me in an employment issue. Mark and his staff are the epitome of professionalism. The quick response and efficiency of Mr. Sereni and staff ensured that I was immediately informed of developments, phone calls were returned promptly and they took as much time as n...ecessary to answer questions in a clear and understandable manner. Due to the skilled representation provided by Mr. Sereni and staff my case resulted in a successful resolution for me. I would highly recommend this firm to anyone in need of legal counsel.

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Posted by anonymous | June 09, 2013 | Employment & Labor

Employment issue

I was fired from a company that accused me of theft without any proof and then reported me to my professional board. I did not steal anything or have any intention of doing so. When I was searching for an attorney to assist me with my employment issue, his name came first on my google search. I... spoke with his assistant who assured me he and his firm was able to help me. He listened to my complaint and had complete faith in me that I was telling him the truth (which I was) and assembled his team to assist me in a suit. He had not had a case such as mine before, however, he was quickly educated to it. He and his team were relentless in their pursuit of the facts in the case and assembled expert witnesses to assist with my defense. The company's lawyer was, for lack of better words, brutal and confrontational in every step of the process and dragged the case out for over two years. Mark always maintained his professional composure despite her verbal abuse and stone walling. My case finally settled with, although nothing close to the lottery everyone thinks they deserve, a win, since it was clear the company was wrong and my name cleared, which is what I really wanted most. I am so happy with the results of this case and it is because of Mark it is so. There are no words to thank him and his team for their dedication and their pursuit of the truth.

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Posted by Karin | July 17, 2012 | Employment & Labor

The Wonderful team at DiOrio and Sereni

The team at DiOrio and Sereni recently handled a wrongful termination case I was involved in. To say they did an excellent job would be understatement. Upon contacting them, they took great pains to gain as much information as they could, as well, they carefully weighed my personal circumstances an...d how they relate to the laws as they are written. I truly appreciated that the team carefully considered my situation before brushing me off as others had done. I found that they were able to express empathy and were relatable while remaining professional and confident. They clearly explained every step of the process we were entering into and asked for my feedback at every juncture. I am very pleased with the outcome of my case and would not hesitate to refer anyone to Mark, Lisanne or anyone else on their team. I have an enormous level of confidence in their abilities and would trust their judgement in any legal matter/proceeding.

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Posted by Brian | December 14, 2011 | Employment & Labor

Mark Sereni and Team - World Class

The attorney's and staff at DiOrio & Sereni are about as good as it gets. My employment issue was understood and addressed very quickly and professionally with a positive outcome. Their decades of experience with employer-employee matters was obvious and I would highly recommend this firm.

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Mark A. Sereni's Lawyer Endorsements

Endorse Mark

Arik Ben-Ari

Litigation lawyer | Jun 05

Relationship: Fellow lawyer in community

"Mark has an impeccable reputation for getting results for his clients and is well regarded by the legal community for his skills and abilities both in and out of the courtroom."

Christian Lassen

Unknown lawyer | Apr 13

Relationship: Fellow lawyer in community

"Well respected in the legal community."

Anthony Bilotti

Litigation lawyer | Dec 04

Relationship: Fellow lawyer in community

"I endorse this lawyer's work."

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Kathryn Chandless

Employment and labor lawyer

Arik Ben-Ari

Criminal defense lawyer

Anthony Bilotti

Workers compensation lawyer

Experience

Rating: 10.0 (Superb)

Honors

2026

Super Lawyer, Philadelphia Magazine

2025

Super Lawyer, Philadelphia Magazine

2025

Top Lawyer, Main Line Today Magazine

2025

Top Lawyer in the fields of personal injury and trial, Delaware County Daily Times' Reader Choice

2024

Top Lawyer, Main Line Today Magazine

2024

Super Lawyer, Philadelphia Magazine

2024

Top Lawyer in the field of medical malpractice, Delaware County Daily Times’ Reader Choice

2023

Top 100 Civil Plaintiff Trial Lawyers in Pennsylvania, The National Trial Lawyers

2023

Top Lawyer in the field of medical malpractice, Delaware County Daily Times’ Reader Choice

2023

Top Lawyer, Main Line Today Magazine

2023

Super Lawyer, Philadelphia Magazine

2022

Top Lawyer in the field of medical malpractice, Delaware County Daily Times’ Reader Choice

2022

Top Lawyer, Main Line Today Magazine

2022

Top 100 Civil Plaintiff Trial Lawyers in Pennsylvania, The National Trial Lawyers

2022

Super Lawyer, Philadelphia Magazine

2021

Top 100 Civil Plaintiff Trial Lawyers in Pennsylvania, The National Trial Lawyers

2021

Top Lawyer, Main Line Today Magazine

2021

Super Lawyer, Philadelphia Magazine

2020

Top Lawyer, Main Line Today Magazine

2020

Super Lawyer, Philadelphia Magazine

2019

Super Lawyer, Super Lawyers

2019

Top Lawyer, Main Line Today Magazine

2019

Super Lawyers, Philadelphia Magazine

2018

Top Lawyer, Main Line Today Magazine

2018

Best Lawyer in the field of employment discrimination, Delaware County Daily Times’ Reader Choice

2018

Super Lawyer, Philadelphia Magazine

2018

Top 100 Civil Plaintiff Trial Lawyers in Pennsylvania, The National Trial Lawyers

2017

Super Lawyer, Philadelphia Magazine

2016

Super Lawyer, Philadelphia Magazine

2016

Best Lawyer in the field of trial work, tied for 1st place, Delaware County Daily Times' Reader's Choice

2015

Super Lawyer, Philadelphia Magazine

2014

Super Lawyer, Philadelphia Magazine

2013

AV Peer Review Rating - Preeminent, Martindale-Hubbell

2013

Super Lawyer, Philadelphia Magazine

2012

Top Lawyer, Main Line Today Magazine

2012

Super Lawyer, Philadelphia Magazine

2011

Awesome Attorney, Suburban Life Magazine

2011

Top Lawyer, Main Line Today Magazine

2011

Super Lawyer, Philadelphia Magazine

2010

Awesome Attorney, Suburban Life Magazine

2010

Super Lawyer, Philadelphia Magazine

2009

Top Lawyer, Main Line Today Magazine

2009

Super Lawyer, Philadelphia Magazine

2009

Top 2008 Verdicts/Settlements, Legal Intelligencer

2008

Super Lawyer, Philadelphia Magazine

2007

Super Lawyer, Philadephia Magazine

2006

Super Lawyer, Philadelphia Magazine

2005

Super Lawyer, Philadelphia Magazine

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Work Experience

2004 - Present

Jury Consultant, Jury-Focused - jury focus groups and mock trials

1997 - Present

Partner, DiOrio & Sereni, LLP

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Associations

2014 - Present

Justinian Society of Delaware County

Member

2013 - Present

Concord Townwatch

Solicitor

2010 - Present

National Employment Lawyers Association

Member

2010 - Present

Concord Township Public Safety Advisory Committee

Member

American Association for Justice

Member

Springfield School District

Solicitor

Marple Newtown School District

Solicitor

National School Boards Association, Council of School Attorneys

Member

Pennsylvania School Boards Association

Member

Delaware County School Districts

Special Counsel

The Eastern Pennsylvania Chapter of the National Employment Lawyers Association

Member

Guy G. DeFuria American Inn of Court

Member

Delaware County Trial Lawyers Association

President

American Bar Association

Member

Pennsylvania Bar Association

Member

Delaware County Bar Association

Member

Pennsylvania Association For Justice

Member

Pennsylvania Trial Lawyers Association

Member

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Sample of Legal Cases

Court Upholds Public School District Protection of Taxpayer Funds and Integrity of Competitive Bid System

Successful Trial Court Decision

Third Circuit Court Of Appeals Upholds Public School District’s Ability to Protect the Rights Of Its Kindergarten Students

Successful Third Circuit Court of Appeals Decision

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Education

1987

University of Pennsylvania Law School

Juris Doctor

1987

National Institute for Trial Advocacy - Intensive

Diplomate

1984

St. Joseph's University

Bachelors of Science

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Publications

2015

Pittsburgh Post Gazette Who gets to decide who doesn't have to pay taxes?

2014

Suburban Life Magazine Committed, Connected, Respected

2010

Delaware County Daily Times The Final Word

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Languages

English

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Activity

Legal Answers

Q&A

Once an offer is made, may an employer rescind it based on HR's conversation with a former employer?

03 Nov 2011

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