Richard Kim

CEO and President,
Board Certified Radiologist

Dr. Kim’s family immigrated to Chicago from South Korea in 1977 when he was 11. His parents made a living running a diner on Roosevelt Road in Chicago. He helped his parents every weekend and summer. After he graduated from the University of Chicago, he took over the business to support the family while he worked through his next steps. The very demanding diner business made it a rather easy choice to seek a career in medicine – something both of his parents dreamt for themselves a generation before. The intensity of the diner business gave him an unrelenting work ethic and a belief in providing exceptional customer service. After five years, he matriculated at Rush Medical College, moved on to become a radiology resident and subsequently an interventional radiology fellow at The University of Chicago Hospitals. He founded GK Medical Management in 2005 and has been CEO since that time. In 2002 he joined Sinai Health Systems to serve as the Chairman of Radiology for five years.

Contact Information
richardkim@gkmmi.com | 847-929-5482

Ken Lerner

Chief Operating Officer

Ken joined GK in 2008. He is responsible for the operations of our existing imaging centers, as well as developing partnerships with hospitals for new joint ventures. Prior to joining GK, Ken was a healthcare investment banker responsible for corporate finance and M&A in the healthcare sector. He earned his B.A. in Finance from Miami University and his MBA in Finance and Strategic Planning from the Kellogg School of Management.

Contact Information
klerner@gkmmi.com | 847-929-5455

Grace Choi

Director of Finance

Grace became a part of the GK Management team in 2006. She earned an undergraduate degree in English Literature and an MBA from Ohio State University. As the Director of Finance Grace oversees the following: cost and general accounting, accounts receivable and collections, payroll, and risk management.

Contact Information
gracechoi@gkmmi.com | 847-929-5472

Juan Gonzalez

Director of Information Technology

Juan joined the GK management team in 2005. He earned his B.A. in Accounting and MS in Health Informatics and has 21 years of experience managing healthcare IT for hospitals and radiology facilities. Juan was formerly the Director of IT for University of Illinois Hospital & Health Sciences System.

Contact Information
juang@gkmmi.com | 847-929-5476

Catherine Silas

General Counsel & Director of Revenue Cycle Management

Catherine came aboard in 2009. She is responsible for legal issues, compliance, and the oversight of the revenue cycle department. Prior to joining the GK team, Catherine earned her B.A. at University of Colorado and her J.D. at Georgetown University Law Center.

Contact Information
csilas@gkmmi.com | 847-929-5464

Caille Thommes

HR Coordinator

Caille joined GK as the HR Coordinator in May of 2018. She began her career in Human Resources after earning her B.A. in Communications from Southern Illinois University Edwardsville. Prior to moving to GK, she supported the HR team of a large manufacturing company.

Contact Information
cthommes@gkmmi.com | 847-929-5401

Marina Rossomakha

Credentialing Specialist

Marina joined GK in 2014. As a Credentialing Specialist, Marina is responsible for maintaining all physician and facility licensing, obtaining new payor contracts and keeping all relevant parties and entities up to CMS standards. She earned both a B.A. in Sociology and Criminal Justice and a Masters in Legal Studies from Loyola University Chicago.

Contact Information
mrossomakha@gkmmi.com | 847-929-5482