Colleen Bannon

For many years Colleen was also a practicing attorney, focusing on privacy and data security and representing numerous medical providers, retailers, e-commerce and public entity clients in data breach actions. She is also a highly experienced employment law attorney who has defended clients in discrimination, civil rights and public entity liability matters.

With a deep background in litigation support and information technology, Colleen also successfully led the firm’s E-Discovery program. In this capacity, she worked closely with other attorneys in the firm to provide their clients with cutting-edge legal advice and guidance in this complex area of law. Her understanding of technology applications was significant to her employer and business owner clients, particularly when dealing with exposure in privacy and data security.

She has spoken at numerous conferences, as well as internal seminars, on the topics of electronic discovery in litigation, social media in the workplace, and privacy and data security. She was an author for The Labor Report, a monthly publication of the Pennsylvania Chamber of Business and Industry, which features articles on employment law issues including sexual harassment, disability and racial discrimination.

Colleen has a storied history with the firm. She began employment with Marshall Dennehey Warner Coleman & Goggin as a member of the firm's support staff in 1980. While continuing full-time employment, first as an administrative assistant and then as an applications specialist within the firm's IT department, she obtained her Bachelor of Arts degree, magna cum laude, from Holy Family College in 1992. She then went on to receive her juris doctor from Temple University School of Law in 1996.

Thought Leadership

An Even Dozen: Marshall Dennehey Named One of the Philadelphia Region’s “Best Places to Work” for 12th Consecutive Year

May 30, 2024
For the 12th year in a row, Marshall Dennehey has been selected one of the Philadelphia region's 'Best Places to Work' by the Philadelphia Business Journal. The award recognizes the company's achievements in creating a positive work envir

Marshall Dennehey Named Among 2022 Most Recommended Law Firms by BTI Consulting Group

December 7, 2022
BTI Consulting Group, the leading provider of strategic market research to the legal community, has recognized Marshall Dennehey as a law firm that top legal decision makers frequently recommend.

Marshall Dennehey Named a 2022 “Tipping the Scales” Firm by the Diversity & Flexibility Alliance

November 10, 2022
Marshall Dennehey has been named a 2022 “Tipping the Scales” law firm by the Diversity & Flexibility Alliance, as reported in the organization’s New Partner Report.

Marshall Dennehey Celebrates 60th Anniversary With Firmwide Charity Initiative

September 22, 2022
Marshall Dennehey Warner Coleman & Goggin, an Am Law 200 law firm and one of Pennsylvania’s largest law firms, is celebrating 60 years in business. Founded in 1962 by Francis E. Marshall, who was later joined by Gerald Dennehey, John R.

Marshall Dennehey Celebrates a Decade of Being Named One of the Philadelphia Region’s “Best Places to Work”

July 28, 2022
For the 10th consecutive year, Marshall Dennehey has been selected one of the Philadelphia region's 'Best Places to Work' by the Philadelphia Business Journal. The award recognizes the company's achievements in creating a positive work en

Classes/Seminars Taught

Using Technology to Find Facts Fast, Insurance Carrier's 2017 Panel Counsel Summit, May 8 - 10, 2017

The Many Considerations Pertaining to the ESI 30(b)(6) Witness, International Association of Defense Counsel, Construction Law Committee, Annual Meeting, 2008

E-Discovery Law Update, Pennsylvania Defense Institute Annual Meeting, 2007

Electronic Data: When Delete Does Not Mean Goodbye, PLRB Claims Conference, 2006 Annual Meeting

Electronic Discovery and the Federal Rules of Civil Procedure, Manufacturers Alliance/MAPI, 2006