Deirdre Breakenridge earned her BA in Communications with a concentration in Public Relations from Glassboro State University in 1988, now known as Rowan University located in Glassboro, New Jersey. She went on to complete her MBA in Marketing at Fairleigh Dickinson University, located in Madison, New Jersey, completing her degree in 2000.

After completing her undergraduate degree, Breakenridge launched her own agency, The Breakenridge Group, where she took on PFS New Media, a young production and multimedia firm, as a client. PFS co-founders Jason Miletsky and Dennis Chominsky were so impressed with Breakenridge's performance they opted to acquire her agency and appointed Breakenridge as Vice President and Director of Communications. Breakenridge combined her public relations and marketing expertise with Chominsky and Miletsky's strengths in advertising, video production and Web development to create a full-service agency. Shortly thereafter, Breakenridge and Miletsky bought out Chominsky's partnership and formed PFS Marketwyse. Miletsky headed the agency as CEO and Breakenridge was appointed President.

Breakenridge, excited to take the next step in her career, began writing books about her experience working in the public relations industry. Breakenridge's first book, Brand Building in the Digital Economy was published by Prentice Hall in May 2001. This book was one of the first complete frameworks for integrating online and offline marketing strategies.

In February 2003 she penned her second book, The New PR Toolkit, published by FT Press and co-authored by Thomas J. DeLoughry, former Executive Editor of Internet World magazine, where he had a front-row seat for the dot-com craze. Together, the two authors developed a blueprint for making the most out of the new online tools available to communications professionals.

Breakenridge's third book, PR 2.0: New Media, New Tools, New Audiences also published by FT Press, was released in 2008. This book covered topics surrounding the new media tools available to businesses and its impact on the public relations and media industries.

Her fourth book, Putting the Public Back in Public Relations, co-authored by Brian Solis, was released in March 2009 and was also published by FT Press. Breakenridge and Solis' focus for this book included the societal and cultural shift that took place with the rise of social media and the change this had on the manner in which businesses communicate with consumers.

For over 10 years, Breakenridge volunteered at Overpeck Riding Center in Leonia, New Jersey where she was able to teach others how to properly groom, care for, and safely ride horses. Through her volunteer work she aimed to influence and communicate to others her love of horses, in addition to sharing her knowledge on providing and maintaining the horses with a healthy lifestyle.

Breakenridge has also spent her time as an adjunct professor at Fairleigh Dickinson University in Madison, New Jersey where she taught courses on public relations and interactive marketing for the Global Business Management program. Breakenridge's agency, PFS Marketwyse, also supports an internship program in which students from local New Jersey universities gain experience in the communications arena.

Professionally, Breakenridges's company has engaged in pro-bono work for the Juvenile Diabetes Research Foundation, The Pharmaceutical Safety Institute, and Crohn’s and Colitis Foundation of America.