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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.

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.