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

dioriosereni.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

5 star (54)

4 star (0)

3 star (0)

2 star (0)

1 star (0)

Showing 1 - 5 of 54 client reviews from Avvo

Posted by Katherine | December 11, 2024 | Hired Attorney

Incredible Lawyer, Results Driven

I highly recommend Mark Sereni, Esquire. I hired Mark in 2024 and he was absolutely exceptional in helping me win a complex defamation and invasion of false light case that had serious personal, professional, and financial implications for me. From start to finish, Mark demonstrated an unparallel...ed level of professionalism and dedication. What stood out the most was Mark's ability to deeply understand the details of my case, including the emotional and professional toll it had taken on me and how it was affecting my business. He didn’t just see me as a client; he genuinely placed himself in my shoes, which made all the difference in crafting a strategy that resonated with both the legal requirements and my personal goals. Mark’s communication skills are superb. He kept me informed at every step, ensuring I felt supported and understood throughout the process. He explained complex legal concepts in a way that was easy to understand, which made me feel confident and prepared during every stage of the case. He maintained a calm, cool, and collected presence at all times. Mark was incredibly prepared and never missed a beat in all that he put together for my case. Under pressure, Mark truly shines. His ability to stay calm, focused, and strategic, even in high-stakes moments, was impressive. He devised a winning strategy that not only addressed the legal aspects of the case but also showcased his deep insight into human dynamics and effective mediation tactics. Mark worked hard to get me a winning outcome and I couldn't be more happy. Even the mediator of my case said to me, "You've got a great lawyer who is well prepared." I highly recommend Mark Serini for any legal needs. His commitment, expertise, and ability to deliver results are second to none.

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Posted by Matthew | May 25, 2024 | Hired Attorney

Man of Integrity

I couldn’t be more happy with the outcome of my case. Marks knowledge and expertise of the law got me a very fair settlement. I would hire him and his staff again if ever I am in need of a lawyer.

Posted by anonymous | June 16, 2025 | Hired Attorney

Defamation and discrimination

Mark was an excellent attorney. He was very upfront and honest about the process. His fees were very reasonable for everything he does. Answers questions in a very timely matter. I was very satisfied in the outcome. I would recommend him.

Posted by Liz | October 21, 2025 | Consulted Attorney

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 Jeff | July 9, 2025 | Consulted Attorney

Outstanding Client Focused Service

I would like to share my opinion regarding the exceptional service provided by Mark and his team. I could not be more delighted with their work. When I approached them with a time-sensitive matter, they responded with remarkable efficiency and professionalism. They delivered exactly what I neede...d within my tight deadline. Mark's expertise was evident throughout our interactions, but what I feel sets him apart is his commitment to me - ensuring I fully understood every critical aspect of my situation and its implications. I feel he combines deep legal knowledge with a warm, genuine, client-focused approach. I felt valued and well-cared for by Mark. His communication style and attention to detail gave me complete confidence. Mark did not just provide legal services for me — he built trust and delivered peace of mind. I highly recommend him to anyone seeking an attorney who combines technical excellence with outstanding client service.

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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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