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Our Management

Jonathan D. Stephenson, MD

Dr. Jonathan Stephenson


Jonathan Stephenson, MD received his Bachelor of Science and graduated Summa Cum Laude from the University of Richmond in Richmond, Virginia.  He received his Doctor of Medicine from Eastern Virginia Medical School in Norfolk, VA.  Dr. Stephenson completed his transitional year residency at Riverside Regional Medical Center in Newport News, VA, and his residency in diagnostic radiology at Pennsylvania State University Milton S. Hershey Medical Center in Hershey, PA. He conducted his fellowship in cross sectional imaging and women’s imaging at Brown University Rhode Island Hospital in Providence, RI.

Dr. Stephenson joined Quantum in 2007 as a diagnostic radiologist with subspecialty interests in women’s imaging and abdominal imaging.  He is currently Quantum’s body imaging section chief and has served on the finance and operations committees.  He is also the current director of CT and MRI in UPMC Central Division. Since 2011 he has served as the radiology department chairman for Pinnacle Health Hospitals and subsequently the UPMC Central Division. His leadership has been integral to the delivery of radiology services in Harrisburg, PA, and the surrounding communities. In 2023 Dr. Stephenson was elected President of Quantum Imaging and Therapeutic Associates and chair of the Board of Directors.

Elizabeth A. Bergey, MD

Dr. Elizabeth Bergey


Elizabeth Bergey, MD was a phi beta kappa graduate, Dana and Presidential scholar of Franklin & Marshall College in Lancaster, PA where she also earned seven intercollegiate varsity letters.  Dr. Bergey was an alpha omega alpha graduate of Temple University in Philadelphia, PA where she won the top graduate in Radiology award.  She completed her residency at the Cleveland Clinic Foundation in Cleveland, OH where she served as chief resident.  Dr. Bergey completed a fellowship in Pediatric Interventional Radiology at the Children’s Hospital of Pittsburgh and a fellowship in Pediatric Radiology with an emphasis on Neuroradiology at the Children’s Hospital of Philadelphia.

Dr. Bergey joined Quantum in 2001 as a diagnostic radiologist.  In 2005 she was elected to the Board of Directors and served as treasurer and finance committee chairman.  In 2007 she was elected as Quantum’s Board of Directors Chairman, President of the physician group and CEO of the professional corporation.  During this time she has served as a staff pediatric radiologist at Penn State Health Milton S. Hershey Medical Center from 2003 – 2007.  She served two years as chairman of Holy Spirit Hospital in Camp Hill, PA and eight years on the Holy Spirit Hospital system board of directors.  Later, she was appointed President of the UPMC Pinnacle Health Medical Advisory Panel and was the only private physician to have ever served on the UPMC Pinnacle Health Clinical Operations Committee.  Currently she serves on the board of directors for Concert, the UPMC Pinnacle Clinically Integrated Network.  She is an advisory consultant to the Cambridge Management Group and is a USSF D license youth soccer coach.

At Quantum, her leadership and vision prompted and promoted the development of the commercially available Helix® Radiology Performance Suite intelligent workforce and workload management solutions funded by the innovative and progressive minds of her partners at Quantum.  These solutions help radiology groups optimize their most valuable resource, Radiologists’ time.

Tammy Magaro CFO

Tammy Magaro


Tammy joined Quantum in 2011. She is responsible for the financial operations, including financial analysis, reporting, and budgeting.

Wayne Davidson

Wayne Davidson


Wayne joined Quantum in 2002.  He serves as Quantum’s CIO and has responsibility for all technology solutions.  He also serves as the CEO of Q-IT, a wholly owned subsidiary of Quantum.

Cristy Klunk

Cristy Klunk


Cristy joined Quantum in 2001. She is responsible for all clinical operations including physician scheduling and credentialing. She is also responsible for the radiology support team and the teleradiology business.

Ben Slater

Ben Slater

Chief Product and Strategy Officer

Ben Slater joined Quantum in 2018 as Chief Product and Strategy Officer. He is responsible for commercial activities, contracting operations, strategic initiatives and corporate compliance. Prior to joining Quantum, Slater led the development and commercialization of a radiology focused business intelligence product line from within a large global medical imaging software and device manufacturer. These efforts were instrumental in the formation of the current radiology analytics solutions market.

Tara Evans

Tara Evans

Director of Human Resources

Tara joined Quantum in 2012. She oversees all human resources functions. Her responsibilities include recruitment, staffing, on-boarding, training, employee relations and benefits management. Tara also works with her team to ensure employee engagement.