Joshua Penn, MD, FACC

Founder, CEO and Medical Director

As the founder of Diagnostic Partners, Dr. Joshua Penn brings to bear not only a high level of clinical expertise in cardiology and cardiovascular imaging, but also a strong background in digital imaging, network protocols and information and storage technology.

He is board certified in Internal Medicine, Cardiology and Echocardiography, and is a Fellow of the American College of Cardiology. He earned his undergraduate and medical degrees at Brown University, completing his residency in Internal Medicine and Fellowship in Cardiology at Mount Sinai Hospital in New York City.

Following his training, he returned to his native Los Angeles, where he practiced cardiology for 20 years, the last 10 as Director of Cardiology for Cedars-Sinai Medical Care Foundation. During that time, he developed extensive expertise in disease-state management, as well as information technology, EHR, and digital-imaging systems. Dr. Penn has published many articles and abstracts with a focus on congestive heart failure and vascular biology.

Dr. Penn has also lectured extensively on topics such as congestive heart failure, HTN, lipids and cardiovascular risk.

Bridget Mosier, RDCS, RVT

Technical Director

Bridget Mosier is a Licensed Practical Nurse/Cardiac Technician with extensive experience as a diagnostic cardiovascular sonographer and cardiovascular diagnostic ultrasound education specialist.

She did her LPN preparation at Genessee Valley BOCES and her certification in diagnostic sonography from the Rochester Institute of Technology (RIT). Her RDCS and RVT credentials were granted by the ARMDS. She has lab accreditation through ICAEL.

At Diagnostic Partners, Mosier is responsible for field staff management and continuing education, as well as securing and maintaining clients’ IAC accreditations. She also oversees equipment maintenance and quality assurance.

She is a member of the American Society of Echocardiography.


Wendy L. Karrasch

Chief Financial Officer

Wendy L. Karrasch began her career in finance at the prestigious international investment bank Houlihan Lokey, rising from accounts payable supervisor through multiple titles all the way to director of finance.

Immediately before joining Diagnostic Partners, she served as interim chief financial officer at ACF Investment Bank.

She brings with her a strong track record of systems innovation and savvy cost control, as well as an extensive knowledge of regulatory compliance. She is a FINRA registered securities representative.

Karrasch is a magna cum laude graduate of California State University in Los Angeles and holds a B.S. in business administration, with a focus on accounting.

Elizabeth Leming

Director, Performance and Implementation

Elizabeth joins Diagnostic Partners with extensive experience in physician-practice management, with an emphasis on improving financial performance. She most recently ran her own consultancy focusing on optimizing private-practice management.

Prior to that, she was director of patient relations at Southside Regional Medical Center in Virginia, where she oversaw communications, complaint resolution, and client service. She has also served as practice manager in obstetrics and gynecology for the Southside Physicians Network, having previously filled roles there as practice manager for ENT and audiology and financial specialist for bariatric and general surgery.

Elizabeth is a graduate of Roanoke College in Virginia, with a bachelors degree in English and creative writing.

Adam Purks

Vice President of Partnership Development

Adam joined Diagnostic Partners’ business development team in 2007, where he has been responsible for growing and maintaining strategic relationships with the nearly 500 physicians in the Diagnostic Partners network.

Adam came to Diagnostic Partners after seven years with Medical Resources, Inc., an MRI leasing and certified-technologist staffing firm, where he served as Director of Sales and Marketing.

Prior to Medical Resources, Adam led market development teams in the mobile-telecom sector for everything from start-ups to overseeing the mid-Atlantic T-Mobile launch and rollout with CNCG Inc.