30Jan

Michael J. Wiesemann has been promoted to Shareholder

January 30, 2025

Michael joined the firm in 2018 and graduated from University of Pittsburgh School of Law in 2014. His practice focuses on the representation of physicians and health professionals in medical malpractice litigation. He has successfully defended physicians in jury trials in multiple Western Pennsylvania counties as second chair and solo. ...

16Jan

Baum O’Connor Cullen Chmiel announces First Female Managing Shareholder

January 16, 2025

PITTSBURGH, PA – January 1, 2025 – Baum O’Connor Cullen Chmiel, a leading Pittsburgh-based medical malpractice defense law firm, announced that Marian (“Mimi”) P. Cullen assumed the leadership role of Managing Shareholder effective January 1, 2025. In a firm that dates to the 1850s, Ms. Cullen will be the first...

21Sep

2024 Best Lawyers

September 21, 2023

Congratulations to Alan S. Baum, M. Brian O’Connor, Marian P. Cullen, David M. Chmiel, Cassidy L. Neal and R. Kent Hornbrook for being recognized as the Best Lawyers in America for 2024. Michael J. Wiesemann was also selected in the 2024 Best Lawyers “Ones to Watch.” Baum O’Connor Cullen Chmiel...

12Jul

Super Lawyers

July 12, 2023

Shareholder attorneys Alan Baum, Brian O’Connor, Marian Cullen, Dave Chmiel and Cassidy Neal have been recognized as top rated Medical Malpractice attorneys in the 2023 Pennsylvania edition of Super Lawyers® magazine. Associate attorney Michael Wiesemann was also recognized as a Rising Star by Super Lawyers®. Congratulations to all for achieving...

17Apr

Matis Baum O’Connor Changes Name To Baum O’Connor Cullen Chmiel

April 17, 2023

MBO announced today its plan to rename the firm to Baum O'Connor Cullen Chmiel to reflect the long-standing leadership status of Mimi Cullen and David Chmiel.

29Nov

ALLY Initiative Certification

November 29, 2022

Baum O’Connor Cullen Chmiel is proud to announce that we successfully completed the inaugural Allegheny County Bar Association ALLY Cohort program and received our certification at the ALLY graduation on November 10, 2022. Only a select number of legal organizations were selected to participate in the 2022 Cohort. The ALLY Initiative endeavors...

23Aug

Four shareholders included in the 2023 Edition of The Best Lawyers in America

August 23, 2022

Baum O’Connor Cullen Chmiel is pleased to announce that four of its shareholders have been included in the 2023 Edition of The Best Lawyers in America. Please join us in congratulating: Alan S. Baum, Esq. – Medical Malpractice Law – Defendants, Litigation – Insurance, Commercial Litigation, and Health Care Law...

23Aug

Three MBO associates included in the 2023 Best Lawyers “Ones to Watch”

August 23, 2022

Matis Baum O’Connor is proud to announce that Best Lawyers has selected Michael J. Wiesemann, Corey C. Kirkwood and Julia F. Kurtz for inclusion in the 2023 Edition of its “Ones to Watch” list, an honor to recognize lawyers who are earlier in their careers for outstanding professional excellence in...

05Apr

ALLY Initiative

April 5, 2022

We are excited to announce our participation in the Allegheny County Bar Association’s ALLY Initiative Cohort. Only a select number of legal organizations were selected for the 2022 Cohort. Cassidy Neal will be leading this project for the firm to help Matis Baum O’Connor complete the goals of the initiative....

28Sep

Matis Baum O’Connor Ranked in 2021 “Best Law Firms” List

September 28, 2021

Pittsburgh, PA, United States — U.S. News & World Report and Best Lawyers® have ranked Matis Baum O’Connor as a “Tier 1” law firm in two practice areas of their 2021 U.S. News – Best Lawyers® “Best Law Firms” list. MBO ranked as Tier 1 in both the “Medical Malpractice...

News & Results