Before joining Geisinger in July 2006, Berger was a Professor of Medicine and the Director of Interventional Cardiology at the Duke University Medical Center.
Berger has served on the steering committees of many of the cardiology trials that have shaped clinical practice in the last 20 years.
[citation needed] Berger has authored more than 300 original articles and 21 editorials, co-authored 5 Guideline documents and edited many others, published 42 commentaries on clinical trials (many as the former Director of Clinical Trials for MD Consult), authored or co-authored 17 book chapters, edited 2 books, authored 11 invited publications, developed 10 educational tapes, and given hundreds of educational lectures in the US and abroad.
[6] During his time at Duke, Berger hosted a nationally televised cath lab conference that was seen live via the GE TiP-TV hospital network or online each week by as many as 5000 viewers.
[6] In July 2009, Berger was featured on CNN as part of an examination of Geisinger's unique healthcare plan.