SIU School of Medicine Foundation Springfield Office

Decatur Family Medicine - SIU School of Medicine


Our Faculty

Mark Scott

Mark Scott, M.D., Medical Program Director

Dr. Scott was in private practice in Decatur for 10 years prior to joining the SIU Family Medicine Residency Program in 2009. He previously was an Assistant Professor at the University of Kentucky College of Medicine in the Department of Family Medicine and residency director of the Lexington program from 1997-1999. Dr. Scott leads FCM Decatur's Continuous Quality Improvement Committee. Dr. Scott's interest is in quality improvement and patient safety.

Medical Degree: Southern Illinois University School of Medicine
Residency: SIU Decatur Family Medicine Residency Program
Memberships: A.A.F.P., I.A.F.P. S.T.F.M

Jessie Junker

Jessie Junker, M.D., MBA., Residency Program Director

Dr. Junker was residency director then program director at the New Hanover Regional Medical Center Family Medicine Residency Program in Wilmington, North Carolina for 10 years before coming to SIU in December of 2006. Prior to that she was faculty then program director of the Duke / SRAHEC Family Medicine Residency in Fayetteville, North Carolina for five years. Dr. Junker has spent her entire career in academic Family Medicine. She has published several FPINs in collaboration with Family Medicine residents. Dr. Junker's interest is in curriculum design, practice management and all things related to residency education.

Medical Degree: Medical College of Wisconsin
Residency: SIU Quincy Family Medicine Residency Program
Fellowship: Academic Medicine, Duke University
MBA: University of North Carolina - Wilmington
Memberships: A.A.F.P., S.T.F.M., I.A.F.P, and A.F.M.R.D.

Susan Klein

Susan Klein, M.D., Assistant Director

Medical Degree: University of Illinois - Chicago
Residency: SIU Decatur Family Medicine Residency Program
Responsibilities: Program evaluation, curriculum development and evaluation
Memberships: A.A.F.P., S.T.F.M., I.A.F.P, and I.S.M.S.

Dr. Klein worked in private practice from 1993-1998 in Clinton, IL where she also taught students & residents who rotated through her clinic. She became faculty in 1998. Her responsibilities include leading the committee for PCMH which has acheived & maintained accreditation since January 2011. She also develops & maintains faculty program & resident educations. Her interests include Wellness Medicine and Womens Health.

Cesar Arguelles

Cesar Arguelles, M.D., Assistant Director

Medical Degree: Finch University of Health Science/ The Chicago Medical School
Residency: SIU Decatur Family Medicine Residency Program
Memberships: A.M.A., A.A.F.P., S.T.F.M., I.A.F.P, and I.S.M.S

Dr. Arguelles has a great expertise in health information technology and will play a large role in guiding the implementation of the AllScripts electronic medical record in 2015. Dr. Arguelles is a native of the Phillipines.

Charles Ellington

Charles Ellington, M.D.,JD., Assistant Director

Medical Degree / Juris Doctor Degree: Southern Illinois University Schools of Medicine and Law
Residency: SIU Decatur Family Medicine Residency Program
Fellowship: HealthPolicy, Georgetown University School of Medicine
Memberships: A.A.F.P., S.T.F.M., I.A.F.P, I.S.M.S., and A.M.A.

Dr. Ellington was in private practice from 2000-2004 in Arthur, IL. He has served on the boards of multiple community organizations. He completed a health policy fellowship at Georgetown University School of Medicine and The Robert Graham Center for Policy Studies in Primary Care in 2005. He was also named Preceptor of the Year at Georgetown University Family Medicine Residency in 2005. His research interests include rural health, medical legal partners and tort reform. Drs. Ellington and Bradley co-authored a book entitled Physicians' Pocket Lawyer. Dr. Ellington also serves on the Board of Directors for the Decatur Federally Qualified Health Center.

Justin Parker

Justin Parker, M.D., Assistant Professor

Medical Degree: Southern Illinois University School of Medicine, Springfield
Residency: SIU Decatur Family Medicine Residency Program
Memberships: A.A.F.P., A.M.A., I.S.M.S, S.T.F.M., I.A.F.P.

Dr. Parker graduated from the SIU Decatur Family Medicine Residency Program and became the Assistant Director at the program in July 2013. Prior to this, he completed his undergrad at Butler University in Indianapolis IN and received his Medical Degree at the SIU School of Medicine in Springfield, IL. Dr. Parker is the current chair of both the Didactics and the Educational Resources Committees a the residency program. The innovative educational designs and methods utilized for resident training at our program have earned national attention at annual conferences such as the Program Director's Workshop and the Society of Teachers of Family Medicine. In addition to his interest in resident education, Dr. Parker also has research interests in the area of antibiotic stewardship. In collaboration with Wayne Mathews and the SIU School of Medicine, the Downstate Illinois Partnership Against Antibiotic Resistance was launched in 2014 (

Laura Law

Laura Law, MPAS, PA-C, Physician Assistant

Laura earned her Physician Assistant degree at the Southern Illinois University Physician Assistant Program in Carbondale and her Master of Physician Assistant Studies from the University of Nebraska Medical Center. She began working for the SIU Family Medicine Residency Program in 2005 in Decatur. Prior to re-joining our practice she worked as a Physician Assistant and Clinical Assistant Professor at the SIU Carbondale Family Medicine Residency Program and SIU Physician Assistant Program from 2008-2010. She also has one year experience as a Physician Assistant in the Decatur Memorial Hospital Emergency Care Center. In addition to clinical practice, Laura is also an active member of our Patient-Centered Medical Home Committee and has a special interest in health information technology.

Wayne Mathews

Wayne Mathews, P.A.-C, Assistant Professor, PA Program

Wayne Mathews is a certified Physician Assistant who has a Certificate of Added Qualification in Emergency Medicine. Wayne is a graduate of the University of Nebraska Physician Assistant Program, and also has a graduate degree in Epidemiology from the University of Illinois. He has 31 years of experience as a P.A. and has published extensively in the medical literature. He also holds a research position with Family Medicine in Patient Oriented Outcome Research, and assists the department with training of both Residents and Physician Assistants.

Associate Faculty Physicians
Dennis Costerisan

Dennis Costerisan, D.O., Associate Faculty Physician

Doctor of Osteopathic Medicine Degree: University of Osteopathic Medicine and Health - Des Moines, Iowa
Residency: University of Illinois Family Practice Program - Rockford, IL

Dr. Costerisan is in private practice in Mount Zion, IL. He is board certified in Family Medicine. Dr. Costerisan presently serves our program by providing obstetric supervision for our resident's patients.

Adel Hanna

Adel Hanna, M.D., MRCOG, FRCSed, Associate Faculty Physician

Master's Degree in Obstetrics & Gynecology: University of Cairo School of Medicine - Cairo, Egypt
Residencies: Oakwood Hospital & Medical Center - Dearborn, MI
Royal Oldham Hospital - Oldham, England
St. Columcille's Hospital - Dublin, Ireland

John Bradley

John Bradley, M.D.

Medical Degree: University of Missouri at Columbia
Residency: SIU School of Medicine - Springfield
MMM: Tulane University
Memberships: A.M.A., A.A.F.P., I.A.F.P., S.T.F.M.

Psychology Specialist
Bobby Leebold

Bobby Leebold, LCSW, Licensed Clinical Social Worker

Bobby Leebold is a Licensed Clinical Social Worker with Psychology Specialists specializing in the treatment of adults, children, and families. Bobby earned his master's degree in social work from the University of Illinois at Urbana-Champaign. He has worked in multiple settings, and has over 20 years of clinical training and experience in working with depression, anxiety, relationship issues, and behavioral difficulties in children.

Physician Assistants

Physician Assistant Students

Joseph Flamm

Kayla Hudson

Ashley Patel

Ashley Winkler

Administrative Staff
Annette Gilson

Annette Gilson, Family Medicine Administrator

Annette joined SIU School of Medicine in 1995 and has been the Family Medicine Administrator in Decatur since 1997. She oversees the administrative aspects of clinical operations, budget preparation and management, grant and contract administration, human resources, and community relations at the department's residency program and medical offices. She graduated from Millikin University, in Decatur, Illinois with a Bachelor of Science degree in Accounting. Prior to joining SIU, she worked for Decatur Memorial Hospital as a Senior Accountant. Annette is a member of the Association of Family Medicine Administration and Medical Group Managerial Association. She received the Administrative Professional Employee of the Quarter award in 2009.


Tina Hartwig, Medical Education Program Coordinator

Tina has been working in the medical field since 1993 and came to the residency program in July 2005. She has worked as the residency coordinator since July 2006. Her main duties include recruiting, licensing of residents, orientation scheduling and other miscellaneous projects throughout the year. Tina enjoys spending time with her family and friends.


Stacey, Office Manager

Stacey joined SIU Family Physicians in December 2007. She graduated from Richland Community College in 1994. She has worked in the medical field since 1992. Stacey's primary responsibilities include establishing clinic and call schedules for 20+ physicians on a monthly basis, accounts payable, tracking staff work hours and payroll, create and maintain weekly physician noon conference presentations, assists in recruiting faculty and residents and many other miscellaneous duties. Stacey enjoys spending time with her family and friends.


Donna, Medical Education Program Specialist

Donna has over 20 years experience as an administrative assistant. She joined SIU in May 2010. Some duties at SIU include corresponding with community physicians in regards to rotation preparation, and evaluations, tracking of work hour documentation, and scheduling of medical student rotations.

The mission of the Southern Illinois University School of Medicine is to assist the people of central and southern Illinois in meeting their health care needs through education, patient care, research, and service to the community.


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