Rush Copley Administrative Team
John Diederich, MA, MBA, FACHE
John Diederich was named president and CEO of Rush Copley Medical Center in November 2019. He is the 8th CEO in Rush Copley’s 133-year history. An outcomes-oriented executive leader with a history of active community involvement, Diederich has risen through the ranks to become an accomplished strategic thinker, skilled administrator and affable health care leader.
Prior to his current role, Diederich served as senior vice president and Chief Operating Officer of Rush Copley since 2006, where he oversaw clinical, ancillary and support operations of the hospital including a $50 million annual capital improvement budget and all hospital construction projects. He joined the hospital’s executive team as vice president of ancillary operations in 2002, and previously held management roles in departments including IT, finance and patient registration. Diederich, who has been at Rush Copley since 1985, began his career at the medical center as a teenager working in the hospital’s kitchen.
He received his Bachelor of Business Administration, specializing in management science from the University of Iowa, where he also earned a Master of Arts degree in hospital and health administration and a Master of Business Administration degree. Diederich completed the Advanced Executive Program at the Kellogg School of Management, Northwestern University, and is a fellow of the American College of Healthcare Executives.
As a survivor of the largest mass shooting in United States' history, Diederich speaks to organizations across the country about his unique active shooter experience. He shares his story of enhancing workplace safety and training 2,500 hospital employees in active shooter response, and his personal survival story of putting this training to the test at the Route 91 Concert Shooting in Las Vegas on October 1, 2017.
Diederich, his wife Joanne, and their three sons reside in Aurora where he is the Chairman of the Board of the Community Foundation of the Fox River Valley, a past Chairman of the Board of the Aurora Regional Chamber of Commerce and an active board member of the Marmion Academy Board of Trustees. The Diederichs actively support their community and volunteer with many area non-profit organizations.
Mary Shilkaitis, MSN, MBA, RN, NEA-BC, FACHE
Senior Vice President, Operations
Chief Operating Officer, Chief Nursing Officer
Mary Shilkaitis was named senior vice president and Chief Operating Officer of Rush Copley Medical Center in 2019. A dynamic, team builder with a passion for excellence in patient care, Shilkaitis brings more than 25 years of progressive clinical and operational leadership with a proven record of improving quality, patient safety, clinical service revenues, productivity and business strategy.
Prior to her current role, Shilkaitis served as vice president of patient care services and Chief Nursing Officer. In that capacity she provided leadership for clinical and nursing operations across the organization, oversaw service line planning and administration, and strategic partnership development, including physician recruitment.
She joined Rush Copley in 2001 as vice president of women’s services. Previously Shilkaitis held leadership positions as director of women and children’s services at Central DuPage Hospital and director of pediatric services at Hoffman Estates Medical Center. She began her career as a neonatal and pediatric intensive care nurse.
Shilkaitis earned a baccalaureate degree from Illinois Wesleyan University and a master’s degree in nursing and business administration from Lewis University in Romeoville, Illinois, where she was honored with the Lasallian Leadership Award. She is a fellow of the American College of Health Care Executives and member of the American Organization of Nurse Executives. She holds a nurse executive advanced board certification (NEA-BC) from the American Nurses Credentialing Center.
Shilkaitis is involved in several community organizations and boards including the Nursing Advisory Council for Aurora University, Clinical Oversight Committee for Illinois Hospital Association and Board member for River West Radiation Center. She currently serves as adjunct faculty at Lewis University and as non-remunerated adjunct faculty at Rush University.
Steve B. Lowenthal, MD, MPH
Senior Vice President, Medical Affairs
Chief Medical Officer
As Senior Vice President, Medical Affairs and Chief Medical Officer, Dr. Lowenthal is the primary liaison between the Medical Staff and Administration of Rush Copley Medical Center.
Dr. Lowenthal's primary responsibilities include oversight of Medical Staff credentialing, privileging and bylaws, the family medicine residency program, and continuing medical education for physicians. He also is responsible for the hospital's quality and patient safety programs as well as physician relations and physician services.
Dr. Lowenthal brings a myriad of expertise to the medical center including vast experience in quality and patient safety program development, clinical informatics and its use in evidenced based clinical practice as well as Six Sigma Black Belt Training, a highly disciplined technique focusing on process improvement. He received his Doctor of Medicine degree from The Chicago Medical School, Chicago. In New York, he completed one year of General Surgery residency before moving to Los Angeles, California where he completed residency training in Urology. He also earned a Master of Public Health degree in health services administration from the Medical College of Wisconsin.
Dr. Lowenthal resides in St. Charles and has four adult children, two of whom are now fourth generation physicians.
Brenda Van Wyhe, MBA, CPA
Senior Vice President, Finance
Chief Financial Officer
Strong financial skills and technical project expertise, combined with a strong sense of fiscal responsibility are what make Brenda Van Wyhe a highly effective finance administrator. Her responsibilities include financial reporting, accounts receivable management, managed care contracting and reimbursement, materials management and medical records.
Brenda received her Bachelor of Science degree from Clarion University of Pennsylvania and her Master of Business Administration degree from DePaul University. She is a CPA and has served as an adjunct instructor for Aurora University.
Active in the community, Brenda is treasurer for the Oswego Chamber of Commerce, Vice Chair of the Oswego Economic Development Commission and serves on the Oswego YMCA Board, the Sugar Grove Chamber of Commerce, and is a committee member for Mutual Ground. She is past treasurer for the Oswego Economic Development Corporation and the Oswego Rotary Club and has participated on various other committees including Kendall County CASA, Women's Topic, Finance Committee and Advisory Committees for District 308. Brenda resides in Sugar Grove.
Vice President, Legal Affairs and General Counsel
As Vice President and General Counsel, Ryan is responsible for the overall legal affairs at Rush Copley and its affiliated operations. Ryan has extensive experience in hospital and health law, as well as the management of medical professional liability matters. During his decade of service at the Illinois Hospital Association (IHA), Ryan held several positions, including Director for the Illinois Provider Trust and Illinois Risk Management Services, where he managed litigation and liability matters for large health systems. Prior to joining the IHA, Ryan was an attorney with a large, national professional liability insurance company located in Chicago. Ryan began his legal career in 1993 at a Chicago law firm where he concentrated his litigation practice on aviation-related matters.
Originally from the East Coast, Ryan received his Bachelor of Arts degree from the State University of New York at Albany and his law degree from the University of Akron School of Law. Ryan is multi-engine rated commercial pilot who enjoys flying his two sons around the Midwest.
Ryan is a member of the Illinois Association of Healthcare Attorneys (IAHA), and an elected member of the Gower District 62 school board.
Ryan lives in Burr Ridge with his wife and two sons.
Vice President, Information Technology
Chief Information Officer
A highly effective leader on the cutting edge of technology, Dennis DeMasie is no stranger to strategic planning, hospital operations and information systems management. With over 20 years of healthcare experience, he joined Rush Copley in 2007.
As Vice President of Technology and Chief Information Officer, Dennis is responsible for development and implementation of information technology initiatives and all operational activities of the IT department.
Dennis earned his B.S. in Computer Technology from Purdue University. He received an MBA in Healthcare Administration from the University of Phoenix, where he now teaches online graduate and undergraduate level courses on the use of IT in Health Care.
He is a member of the College of Healthcare Information Management Executives, the Healthcare Information Management Systems Society, and the American Hospital Association.
Dennis resides in Aurora and has four grown children.
Diane D. Homan, MD
Vice President, Clinical Innovation
Chief Medical Informatics Officer
Dr. Homan facilitates the use of clinical informatics to advance clinical quality and patient safety and provides medical leadership for all clinical information systems that assist physicians in the delivery of patient care.
Collaborating with key areas of responsibility including Care Management, Infection Prevention, Quality and Patient Safety, Dr. Homan uses data to improve quality outcomes through standardization. Monitoring metrics that contribute to Value Based Purchasing, Readmissions, Hospital Acquired Conditions while implementing Meaningful Use criteria continues to move the organization to high reliability.
Dr. Homan will also continue to represent Rush Copley at state and national conferences presenting our excellent clinical outcomes seeking to network and learn from those who represent best practices in the healthcare industry.
Dr. Homan has been on the faculty at Rush University for over 30 years, initiated and served as the Director of the Rush Copley Family Medicine Residency, and also serves on several local Boards including the Kane County Advisory Committee.
Alexander F. Pope, CFRE
Vice President, Foundation and Chief Development Officer
Alexander (Alex) Pope serves as Chief Development Officer. His career spans 25 years of professional experience in institutional advancement. He has particular expertise in identifying opportunities for and implementing fundraising best practices (including action and outcome-based performance metrics) which create efficient and very effective development programs. His career path has allowed him to gain a fairly equitable balance between major gift work (individual and corporate) and other foundation/fundraising operations, including volunteer board management, direct marketing, workforce giving, special events, planned giving and advancement services.
He has a strong track record of success not only as a fundraiser, but also as a manager and leader. The majority of this experience/success is within regional and national “hub-and-spoke” organizations including Advocate Health Care, the American Association of Oral and Maxillofacial Surgeons, the American Society of Plastic Surgeons, and the American Academy of Pediatrics.
Alex has served on the Association of Fundraising Professionals, Chicago Chapter, Board of Directors since 2007 to 2014, including as president in 2010. In 2013 Alex was awarded the Chapter’s prestigious Presidents Award recognizing his leadership and service to the industry. Additionally, Alex is a member of the Aurora Noon Rotary Club and Chairman of the Aurora Regional Chamber of Commerce Board of Directors.
Alex is a graduate of Northern Illinois University and resides in Naperville, Illinois, with his wife and four children.
Marcee A. Brummel
Vice President, Rush Copley Medical Group
As Vice President of Rush Copley Medical Group, Marcee is responsible for the overall operations of Rush Copley’s multispecialty medical group. With more than 20 years of healthcare experience, she has been instrumental in bringing excellence in primary and specialty healthcare services to the community. Under her leadership, the medical group has grown to more than 100 providers offering healthcare services in Aurora, Naperville, Oswego, Sugar Grove, and Yorkville, including Rush Convenient Care locations throughout the area.
Marcee received her Bachelor’s degree in Business and Communications from Northern Illinois University. She is an active member of The Medical Group Management Association and serves on the board of Invest Aurora Illinois. Marcee resides in Sheridan with her family.
Assistant Vice President, Ancillary Services
An effective leader, David Petasnick brings nearly 20 years of clinical and operational experience to Rush Copley’s administrative team.
As Assistant Vice President, Ancillary Services, David oversees multiple clinical areas including Imaging Services, Laboratory, Pharmacy and Emergency Services. In addition, he manages the Healthplex and Hospitality Services at Rush Copley.
David received his bachelor’s degree in political science and a master’s degree in Hospital and Health Administration from the University of Iowa. David, his wife, and their three children reside in Oswego.
Suzanne Sterchi, MSN, RN, NEA-BC, CNOR
Assistant Vice President, Patient Care
With a passion for clinical excellence and building collaborative multi-disciplinary teams, Suzanne Sterchi brings a wealth of experience and accomplishments to Rush Copley’s leadership team. With over 40 years of nursing and progressive leadership experience, she joined Rush Copley in 2005.
In her role, Suzanne provides administrative direction for Perioperative Services, Nursing Professional Practice, Spiritual Care, Heart and Vascular Institute, Neuroscience Institute and Movement Disorder Program, and Patient Support Services. She earned her Bachelors of Science in Nursing, summa cum laude, from Southern Illinois University in Edwardsville, IL and her Masters of Science in Nursing Administration from Lewis University in Romeoville, IL. Suzanne is a Fellow of the Advisory Board, having completed the Executive Leadership Academy, Washington, DC. She holds a nurse executive advanced board certification (NEA-BC) from the American Nurses Credentialing Center and has maintained national certification as a Perioperative Registered Nurse (CNOR) since 1982.
Suzanne serves on the Waubonsee Community College Nursing Advisory Board, serves as adjunct faculty for Lewis University Graduate School of Nursing and is a member of American Organization of Nurse Executives, Illinois Organization of Nurse Leaders, and the Association of Perioperative Registered Nurses. She resides in Plainfield with her family.
Brenda K. Fann, MD, FAAFP
Assistant Vice President, Medical Affairs
As the Assistant Vice President, Medical Affairs, Dr. Fann has both administrative and clinical roles at Rush Copley. Dr. Fann is the administrative support for Medical Staff Credentialing and Privileging and the Professional Practice Committee, our centralized physician peer review committee, and reports to our Chief Medical Officer, Dr. Lowenthal. Additionally, Dr. Fann is responsible for the Medical Staff Bylaws, continuing medical education for physicians, and the Medical Staff Office.
Prior to her current role, Dr. Fann served as the Chair of the Credentials Committee since its inception in 2007. In this role, she developed and implemented a solid and consistent credentialing and privileging process within the organization. For her work on this committee, she was selected by her peers for the Medical Staff Leadership Award in 2009. Additionally, she has been a long-standing member of the Medical Executive and Bylaws Committees.
Dr. Fann, a board-certified family physician, was the Program Director of the Rush Copley Family Medicine Residency Program and Clinic Director for their Family Medicine Center. She is still clinically active as senior faculty within the residency program. Dr. Fann has been on the medical staff at Rush Copley Medical Center and an Assistant Professor at Rush Medical College since 2001.
Dr. Fann received a Bachelor of Science degree with high honors in biology from Elmhurst College. She graduated from the University of Illinois, College of Medicine with Alpha Omega Alpha Honors and completed her training at the Kaiser Permanente Family Medicine Residency Program in Riverside, California. Dr. Fann is currently pursuing an MBA in Healthcare Administration.
Assistant Vice President, Planning and Business Development
As Assistant Vice President of Planning and Business Development at Rush Copley, Terese Raabe is responsible for evaluating new business opportunities and strategic initiatives, planning-related regulatory functions and developing and implementing the hospital’s community health needs assessment. With more than 20 years of experience in healthcare, she spearheads the strategic vision for Rush Copley with her extensive experience in analytics, planning and strategy.
Terese holds an MBA and BS in administration from Benedictine University. She is a professional member of American College of Healthcare Executives and the Society for Healthcare Strategy & Market Development. Terese is an active member of the community and currently serves on the Board of the Fox Valley United Way, the Kendall County Health Advisory Board and is an executive member of the Kane Health Counts Committee. She resides in Oswego with her husband and two children.