RUSH Copley Administrative Leaders

RUSH Copley Medical Center Administrative Leaders

RUSH Copley Medical Center Administrative Leaders

John Diederich, MA, MBA, FACHE

John Diederich, MA, MBA, FACHEPresident, CEO

John Diederich was named president and CEO of RUSH Copley Medical Center in November 2019. He is the 8th CEO in RUSH Copley’s 137-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 in hospital and health administration and a Master of Business Administration. 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 U.S. 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 Oct. 1, 2017.

Diederich, his wife, Joanne, and their three sons reside in Aurora, Ill., where he is a past 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 nonprofit organizations.
(630) 978-4941

Mary Shilkaitis, MSN, MBA, RN, NEA-BC, FACHE

Mary Shilkaitis, MSN, MBA, RN, NEA-BC, FACHESenior Vice President, Operations and Chief Operating 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.
(630) 499-2475

Brenda Van Wyhe, MBA, CPA

Brenda Van Wyhe, MBA, CPASenior Vice President, Finance and 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 and budgeting, accounts receivable management and billing, decision support, information services and health information management.

Van Wyhe 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, Van Wyhe serves as Vice-Chair on the Oswego Economic Development Commission and is a member of the Mutual Ground Advisory Committee. Past roles include: Chairperson of the  Oswego YMCA Board, Director for the Sugar Grove Chamber of Commerce, treasurer for the Oswego Economic Development Corporation; the Oswego Rotary Club: Kendall County CASA and Oswego Chamber of Commerce. She has also served on the Finance Committee and other Advisory Committees for District 308. Brenda resides in Aurora.
(630) 898-3565

Stephen M. Kelanic, MD, FACS, MBA

Stephen M. Kelanic, MDVice President of Medical Affairs and Chief Medical Officer (CMO)
As the Vice President of Medical Affairs and Chief Medical Officer (CMO), Dr. Stephen Kelanic drives excellence in patient care, promotes physician collaboration, and ensures the highest standards of medical practice within the organization. With over two decades of dedicated service to RUSH Copley, Kelanic brings a wealth of experience and expertise to his role.
In his position, Kelanic continues to uphold his clinical practice while concurrently fulfilling his responsibilities as a physician executive. He oversees crucial aspects of medical operations, including physician services, medical staff credentialing, privileging and peer review processes, RUSH Copley Family Medicine Residency Program, continuing medical education and acts as RUSH Copley medical staff liaison with the RUSH system. Furthermore, he chairs the hospital Quality & Safety Committee and serves as the surgical director of RUSH Copley Medical Group.
Throughout his career, Kelanic has demonstrated exceptional leadership and commitment to his profession. He has previously served as the chief of the Medical Staff and chaired the department of surgery at RUSH Copley. Kelanic's dedication and contributions have been recognized through his appointments to the board of directors of both RUSH Copley Medical Group and RUSH Health.
Kelanic holds an undergraduate degree from Northwestern University and earned an MBA from the University of Massachusetts – Amherst, enabling him to bring a comprehensive perspective to his role as a physician executive. He completed his medical education at RUSH University and furthered his training as an intern and resident at Rush-Presbyterian-St. Luke's Medical Center. Kelanic is board certified in Otolaryngology and holds a faculty appointment at RUSH University Medical Center, where he actively contributes to medical education and research.
Kelanic resides in Naperville.
(630) 978-4971

Alexander F. Pope, CFRE

Alexander F. Pope, CFREVice President, Philanthropy and Community Engagement

Alexander (Alex) Pope serves as the Vice President, Philanthropy and Community Engagement. His nonprofit service and career spans more than 30 years. He has particular expertise in creating a strong and sustainable culture of philanthropy within organizations and their constituents, and this is accomplished by utilizing two strengths: 1) building partnerships/friendships with all stakeholders and 2) identifying and implementing opportunities for best practices (including action and outcome-based performance metrics). These partnerships and implementation of best practices have resulted in an extraordinarily impactful philanthropic program. He has successfully leveraged philanthropy to be a catalyst for change in impacting the social determinants of health, particularly evolving health equity, in the RUSH Copley community.

Pope has been a member and involved with the Association of Healthcare Professionals for many years, as well as the Association of Fundraising Professionals, Chicago Chapter (served on Board of Directors for many years, including as president). He was even honored to receive the Chapter’s President's Award recognizing leadership and service to the industry.
(630) 978-4946

Marcee A. Brummel

Marcee A. BrummelVice President, RUSH Copley Medical Group
As Vice President of RUSH Copley Medical Group, Marcee Brummel is responsible for the overall operations of RUSH Copley’s multispecialty medical group. With more than 20 years of health care experience, she has been instrumental in bringing excellence in primary and specialty health care 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.

Brummel 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. Brummel resides in Sheridan with her family.
(630) 978-4915

David Petasnick

David PetasnickVice President, Operations
An effective leader, David Petasnick brings over 20 years of clinical and operational experience to RUSH Copley’s administrative team.

As Vice President, Operations, Petasnick oversees multiple clinical areas including, Laboratory, Pharmacy, Emergency Services, Heart and Vascular Services.  In addition, he manages Patient Experience, Material Services, Facilities and Hospitality Services at RUSH Copley.

Petasnick received his bachelor’s degree in political science and a master’s degree in Hospital and Health Administration from the University of Iowa. Petasnick, his wife, and their three children reside in Oswego, Ill.
(630) 978-4882

Abby Hornbogen, MBA, MS, RN, NE-BC

Abby Hornbogen, MBA, MS, RN, NE-BCVice President, Patient Care and Chief Nursing Officer
An adaptive leader with more than 20 years of progressive healthcare leadership experience, Abby Hornbogen, MBA, MS, RN, NE-BC, serves as vice president, patient care and Chief Nursing Officer at RUSH Copley. She leads more than 750 nurses at the medical center and has executive leadership of critical care, orthopedics, neurology, pediatrics, women’s health, perioperative services, therapy services, cancer care, spiritual care and nursing professional practice.

Prior to joining RUSH Copley, Hornbogen served in nursing and operational leadership roles with oversight of strategic program development and clinical operations. She began her career as a labor and delivery nurse.

Hornbogen earned a baccalaureate degree in nursing from University of Illinois-Chicago and a master’s of science degree in healthcare administration as well as an MBA from the University of St. Francis in Joliet, IL. She is board certified by the American Nurses Credentialing Center, is a member of American Organization of Nursing Leadership and serves as a Board of Director for the Greater Joliet Area YMCA.

Hornbogen and her husband and their two children reside in Plainfield, Ill.
(630) 978-6842

Terese Raabe, MBA, FACHE

Terese RaabeAssistant Vice President, Operations and Analytics
Terese Raabe brings over 20 years of strategic, analytic and operational experience to RUSH Copley’s administrative team.

As Assistant Vice President of Operations and Analytics, she is responsible for oversight of analytics and knowledge management, Imaging Services, Midwest Center for Advanced Imaging and RUSH Copley Healthplex Fitness Center. Prior to her current role, she served as Assistant Vice President, Strategy and held leadership roles in strategy, planning, business development and community health engagement.

Raabe holds an MBA and BBA in Management and Organizational Behavior from Benedictine University. She is a professional member of American College of Healthcare Executives and the Society for Healthcare Strategy & Market Development. Raabe 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 Riverwest. She resides in Oswego with her husband and children.
(630) 236-4292

System Leadership

List of RUSH System board members, System officers and other System executives.

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System Leadership

List of RUSH System board members, System officers and other System executives.

Learn more
Learn more