Corporate

Karen L. Davis, RN, MBA

Vice President of Specialty/Division Success
MBA: University of Louisville, Louisville, KY
Bachelor of Nursing: Spalding University, Louisville, KY

Jennifer Fuerst

Associate Director of Practice Operations

Bachelor of Science: Urbana University, Urbana, Ohio 
Experience: More than a decade of management experience in corporate environments. 
 

Amy J. Fuller

Director of PriMed Care Teams

Associate Degree: Applied Science from RETS, Dayton, OH

Charlie Hardtke

Chief Executive Officer
Bachelor of Business Administration: University of Cincinnati, Cincinnati, OH

Robert E. Matthews

VP Quality and Care Design

Served as PriMed Executive Director from 1996-2010

Robert E. Roettker, CPA

MBA: Finance and Information Systems, Xavier University, Cincinnati, OH
Bachelor of Science: Finance and Economics, Xavier University, Cincinnati, OH

Family Practice

Christie Bernard, RN

Practice Manager of PriMed Springboro Pediatrics, PriMed Wright Dunbar Family Practice and Pediatrics

Bachelor of Science: Nursing Degree, Wright State University, Dayton, OH

Mark A. Couch, MD

Board Certification: Family Medicine
Family Medicine Residency: Franciscan Medical Center, Dayton, OH
Medical Degree: Wright State University’s School of Medicine, Dayton, OH
Bachelor of Science: Manchester College, North Manchester, IN

As of May 31, 2022, Dr. Couch has retired. He continues to be involved at PriMED, consulting with the clinical team; however, he no longer sees patients. 

Amy Cox

Practice Manager of PriMed Englewood Pediatrics and Woodbury Family Practice

James A. Derksen, MD

Board Certification: Family Medicine
Family Medicine Residency: St. Elizabeth Medical Center, Dayton, OH. Chief Resident
Medical Degree: Wright State University’s School of Medicine, Dayton, OH
Bachelor of Science: University of Cincinnati, Cincinnati, OH

For many years, Dr. Derksen saw PriMed patients as a Family Practice Physician. Although he has "retired," he now is part of the team at PriMed Clinical Research.

Andrea Dillon, MD, MPH

Board Certified: Family Medicine
Family Medicine Residency: Good Samaritan Hospital, Dayton, OH
Medical Degree: Wright State University, Dayton, OH
Master of Public Health: Wright State University, Dayton, OH
Bachelor of Science: Manchester University, North Manchester, IN

Krista Ducklo, MSN, APRN, FNP-C

Board Certification: Family Nurse Practitioner

Master of Science: University of Cincinnati, Cincinnati, OH

Bachelor of Science: The Ohio State University, Columbus, OH
 

Jessica Emmons, MSN, APRN, FNP-C

Board Certification: Family Nurse Practitioner

Master of Science: University of Cincinnati, Cincinnati, OH

Bachelor of Science: Miami University, Oxford, OH
 

Janette R. Froehlich, MD

Board Certified: Family Medicine
Family Medicine Residency: St. Elizabeth Medical Center, Dayton, OH. Chief Resident
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: University of Dayton, Dayton,OH

Amy J. Fuller

Director of PriMed Care Teams

Associate Degree: Applied Science from RETS, Dayton, OH

Amanda Gedeit, DO

Board Certified: Family Medicine
Family Medicine Residency: Grandview Medical Center, Dayton, OH; Chief Resident
Medical Degree: A.T. Still University Kirksville College of Osteopathic Medicine, Kirksville, MO
Bachelor of Science: University of Wisconsin-LaCrosse, LaCrosse, WI

Thomas Greer, MD

Board Certification: Family Medicine
Family Medicine Residency: St. Elizabeth Medical Center, Dayton, OH
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: Duke University, Durham, NC

Julie Haver, MSN, APRN, FNP-C

Board Certification: Family Nurse Practitioner

Master of Science: University of Cincinnati, Cincinnati, OH

Bachelor of Science: Wright State University, Dayton, OH
 

Kristina Helmick, MSN, APRN, FNP-C

Board Certification: Family Nurse Practitioner

Master of Science: Walden University

Bachelor of Science: Wright State University, Dayton, OH
 

Thomas W. Hirt, MD

Board Certified: Family Medicine
Family Medicine Residency: Miami Valley Hospital, Dayton, OH. Chief Resident
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: University of Dayton, Dayton, OH

Sandy Hofacker, CMPE

Practice Manager of PriMed Centerville Family Practice and Centerville Pediatrics
Training: Medical Office Assistant - Miami Jacobs Career College, Dayton, OH
 

Danielle King

Practice Manager of PriMed Beavercreek Family Practice and Beavercreek Pediatrics

Associates Degree: Medical Office Management, Ohio Institute of Photography and Technology, Kettering, OH

Zach Liapis, DO

Family Medicine Residency: Grandview Medical Center, Dayton, OH

Medical Degree: Doctor of Osteopathic Medicine, Lake Erie College of Osteopathic Medicine, Erie, PA

Undergraduate Degree: Bachelor of Arts, Hanover College, Hanover,  IN

Brandi D. Minch

Practice Manager of PriMed Patterson Wood Family Practice and PriMed Neurology
Bachelors of Science: University of Dayton, Dayton, OH
Associates Degree: Ohio Institute of Photography & Technology

Maureen K. Perez, MD

Board Certified: Family Medicine
Family Medicine Residency: Miami Valley Hospital, Dayton, OH
Medical Degree: Medical College of Ohio, Toledo, OH
Bachelor of Science: Miami University, Oxford, OH

William J. Randall, MD

Board Certification: Family Medicine
Family Medicine Residency: St. Elizabeth Medical Center, Dayton, OH
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: University of Dayton, Dayton, OH

Yvonne Ridenour

Practice Manager of PriMed Huber Heights Pediatrics | Vandalia Family Practice

Bachelor of Science: Urbana University, Urbana, Ohio 

 

Mark R. Schloneger, MD

Board Certified: Family Medicine
Family Medicine Residency: Miami Valley Hospital, Dayton, OH
Medical Degree: Wright State University’s School of Medicine, Dayton, OH

James F. Seiler, MD

Board Certified: Family Medicine
Family Medicine Residency: St. Elizabeth Medical Center, Dayton, OH
Medical Degree: Ohio State University College of Medicine, Columbus, OH

Marlon D. Twyman, MD

Board Certified: Family Medicine
Family Medicine Residency: Mercy Hospital, Toledo, OH
Medical Degree: Medical College of Ohio, Toledo, OH
Bachelor of Science: Washington University, St. Louis, MO

Teresa VanHoose, MSN, APRN, FNP-BC

Advance Practice Provider Team Lead

Board Certification: Family Nurse Practitioner

Master of Science: Maryville University, St. Louis, Missouri

Bachelor of Science:Wright State University, Dayton, OH
 

Michael Witt, MD

Board Certified: Family Medicine
Family Medicine Residency: United Hospital Center, Clarksburg, WV
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: University of Dayton, Dayton, OH

Megan Wurm (previously Dorsak), DO

Family Medicine Residency: Grandview Hospital, Dayton, OH, Chief Resident
Medical Degree: Univ. of Pikeville- Kentucky College of Osteopathic Medicine, Pikeville, KY
Bachelor of Science: Eastern Kentucky University, Richmond, KY

Internal Medicine

Marsha Cooper, MD

Board Certification: Internal Medicine

Internal Medicine Residency: Tulane University School of Medicine, New Orleans, LA

Internal Medicine Internship: Helene Fuld Medical Center, Trenton, NJ

Medical Degree: Drexel University College of Medicine, Philadelphia, PA

Bachelor of Science: Lincoln University, Oxford, PA

Dr. Cooper joined our office in mid-May. We are so glad she's now part of the Vandalia team, providing comprehensive, coordinated primary care.

Neurology

Brandi D. Minch

Practice Manager of PriMed Patterson Wood Family Practice and PriMed Neurology
Bachelors of Science: University of Dayton, Dayton, OH
Associates Degree: Ohio Institute of Photography & Technology

Ling Xu, MD

Board Certification: Neurology, Neurophysiology, Neuromuscular Disease and Electrodiagnostic Medicine
Fellowship: Neuromuscular disease/neurophysiology, University of Alabama, Birmingham, AL
Neurology Residency: St. Louis University, St. Louis, MO
Medical Degree: Xian Medical University, Xian, Shaanxi, China

Pediatrics

Rogelio "Sonny" Amisola, MD

Board Certification: Pediatrics and Obesity Medicine
Board Eligible: Adolescent Medicine
Fellowship: Adolescent Medicine, Schneider Children's Hospital, New Hyde Park, NY
Pediatric Residency: Beth Israel Medical Center, New York, NY. Pediatric Chief Resident
Medical Degree: University of the East, Ramon Magsaysay Memorial Medical Center, College of Medicine, Quezon City, Philippines                         

Bachelor of Science: School of Allied Medical Professions, University of the Philippines

Christie Bernard, RN

Practice Manager of PriMed Springboro Pediatrics, PriMed Wright Dunbar Family Practice and Pediatrics

Bachelor of Science: Nursing Degree, Wright State University, Dayton, OH

Debra E. Bockhorn, MD

Board Certified: Pediatrics
Pediatric Residency: Indiana University of Medicine, Indianapolis, IN
Medical Degree: Loyola University School of Medicine, Chicago, IL
Bachelor of Science: Ohio State University, Columbus, OH

Matthew W. Byers, MD

Board Certified: Pediatrics
Pediatric Residency: Kosair Children's Hospital, Louisville, KY
Medical Degree: The Ohio State University, Columbus, OH
Bachelor of Science: Wright State University, Dayton, OH

Amy Cox

Practice Manager of PriMed Englewood Pediatrics and Woodbury Family Practice

Caleb Dukeman, MD

Pediatric Residency: Kaiser Permanente Los Angeles Medical Center, Los Angeles, CA

Medical Degree: 2017 Wright State University Medical School, Dayton, OH
Bachelor of Science: Biological sciences, Wright State University, Dayton, OH
Bachelor of Arts: Spanish, Wright State University, Dayton, OH

Randy E. Eisenhut, MD

Board Certification: Pediatrics
Pediatric Residency: Columbus Children's Hospital, Columbus, OH
Medical Degree: University of Kansas Medical School, Lawrence, KS
Bachelor of Science: University of Kansas, Lawrence, KS

Amy J. Fuller

Director of PriMed Care Teams

Associate Degree: Applied Science from RETS, Dayton, OH

Kathleen Gibbs, MD

Board Certification: Pediatrics
Pediatric Residency: Columbus Children's Hospital, Columbus, OH
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: Ohio State University, Columbus, OH

Kathleen Gutman, MD

Board Certification: Pediatrics
Pediatric Residency: Geisinger Medical Center, Danville, PA
Medical Degree: Wright State University School of Medicine
Bachelor of Science: Kent State University, Kent, OH

Amy Hahn, LISW

Behavior Health Consultant

Master of Social Work: University of Cincinnati, Cincinnati, OH
Bachelor of Science: Wright State University, Dayton, OH

Experience: More than 20 years of Behavioral Health experience: acute inpatient setting, school counselor and outpatient counselor.

Matthew G. Hardwick, MD

Board Certification: Pediatrics
Pediatric Residency: Columbus Children's Hospital, Columbus, OH
Medical Degree: Ohio State University College of Medicine, Columbus, OH
Bachelor of Science: Walsh College, Canton, OH

Christopher Harper, MD

Pediatric Residency: Cincinnati Children's Hospital Medical Center, Cincinnati, OH
Medical Degree: University of Oklahoma College of Medicine, Norman, OK
Bachelor of Science: University of Oklahoma, Norman, OK

Special Interests: Pediatric sleep issues and social determinants of health

Sandy Hofacker, CMPE

Practice Manager of PriMed Centerville Family Practice and Centerville Pediatrics
Training: Medical Office Assistant - Miami Jacobs Career College, Dayton, OH
 

Danielle King

Practice Manager of PriMed Beavercreek Family Practice and Beavercreek Pediatrics

Associates Degree: Medical Office Management, Ohio Institute of Photography and Technology, Kettering, OH

Lisa W. Klanke, MD, MS

At the end of the year, Dr. Klanke will no longer being seeing PriMed patients. Read more in her letter to patients and parents.

Claire N. McDowell, MD, FAAP

Board Certification: Pediatrics
Pediatric Residency: Dayton Children's Medical Center, Dayton, OH
Medical Degree: Wright State School University School of Medicine
Bachelor of Science: Olivet Nazarene University, Bourbonnais, IL

Stephanie Morrison, MD, FAAP

Board Certified: Pediatrics

Pediatric Residency: Wright State University/Wright-Patterson Air Force Base, Dayton, OH
Medical Degree: Uniformed Services University, Bethesda, MD
Bachelor of Science: Arizona State University, Tempe, AZ

Dr. Morrison's office has moved. She now sees patients from PriMed Centerville Pediatrics.

Katherine Muse, MD

Board Certification: Pediatrics
Pediatric Residency: Stanford University, Palo Alto, CA
Medical Degree: Wright State University School of Medicine, Dayton, OH
Bachelor of Science: Bowdoin College, Brunswick, ME

Germaine Neh, MD

Pediatric Residency: St. Joseph University Medical Center, Paterson, NJ
Medical Degree: University of Buea Faculty of Health Sciences, Buea, Cameroon
Bachelor of Science: University of Buea, Buea, Cameroon

Linda E. Odenigbo, MD

Board Certified: Pediatrics
Pediatric Residency: Harlem Hospital Center, New York, NY
Medical Degree: University of Iloria, Nigeria

Alonzo Patterson III, MD

Board Certified: Pediatrics
Pediatric Residency: Columbus Children's Hospital, Columbus, OH
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: Wright State University, Dayton, OH

Erin Perkey, DO

Board Certified: Pediatrics
Pediatric Residency: Nationwide Children's Hospital, Columbus, OH- Dual Chief Resident
Medical Degree: Ohio University College of Osteopathic Medicine, Athens, OH
Bachelor of Science: Miami University, Oxford, OH

Janelle Pool, MD

Board Certification: Pediatrics
Pediatric Residency: Dayton Children's Medical Center, Dayton OH
Medical Degree: Wright State University School of Medicine, Dayton, OH
Bachelor of Science: Olivet Nazarene University, Bourbonnais, IL

Dr. Pool has reduced her hours to see patients. Due to this change, parents are asked to select one of the other PriMED pediatricians for their child's primary care physician. Read more. 

Yvonne Ridenour

Practice Manager of PriMed Huber Heights Pediatrics | Vandalia Family Practice

Bachelor of Science: Urbana University, Urbana, Ohio 

 

Rachel Sidwell, MD

Board Certified: Pediatrics
Pediatric Residency: Cohen Children's Medical Center, New Hyde Park, NY
Medical Degree: University of Cincinnati, Cincinnati, OH
Bachelor of Science: Miami University, Oxford, OH

Kara Szlag, MD

Pediatric Residency: Nationwide Children's Hospital, Columbus, OH
Medical Degree: University of Louisville, Louisville, KY
Bachelor of Science: University of the Cumberlands, Williamsburg, KY

Divya Thomas, MD, MPH

Pediatric Residency: St. Louis University, St. Louis, MO
Medical Degree: M.S. Ramaiah Medical College, Bengaluru, India
Masters Degree: Public Health, Grand Canyon University, www.gcu.edu

John W. Thomas, MD

Board Certified: Pediatrics
Pediatric Residency: Wright Patterson Air Force Base, Dayton OH - Chief Resident
Medical Degree: University of Michigan Medical School, Ann Arbor, MI
Bachelor of Science: Penn State University, State College, PA

Tiffany Wissman, MD

Board Certified: Pediatrics
Pediatric Residency: Dayton Children's Medical Center, Dayton, OH
Medical Degree: Wright State University School of Medicine, Dayton, OH
Bachelor of Science: Xavier University, Cincinnati, OH

Research

Rogelio "Sonny" Amisola, MD

Board Certification: Pediatrics and Obesity Medicine
Board Eligible: Adolescent Medicine
Fellowship: Adolescent Medicine, Schneider Children's Hospital, New Hyde Park, NY
Pediatric Residency: Beth Israel Medical Center, New York, NY. Pediatric Chief Resident
Medical Degree: University of the East, Ramon Magsaysay Memorial Medical Center, College of Medicine, Quezon City, Philippines                         

Bachelor of Science: School of Allied Medical Professions, University of the Philippines

James A. Derksen, MD

Board Certification: Family Medicine
Family Medicine Residency: St. Elizabeth Medical Center, Dayton, OH. Chief Resident
Medical Degree: Wright State University’s School of Medicine, Dayton, OH
Bachelor of Science: University of Cincinnati, Cincinnati, OH

For many years, Dr. Derksen saw PriMed patients as a Family Practice Physician. Although he has "retired," he now is part of the team at PriMed Clinical Research.

Ann Trzaska Moell, MD

Working as an investigator with PriMed Clinical Research provides Dr. Moell with an exciting opportunity to participate in the process of innovation in the science of medicine. She is a graduate of The Ohio State University College of Medicine in Columbus. She returned to Dayton to continue her medical training with a residency at St. Elizabeth Medical Center. Dr. Moell has a special interest in women’s health and pediatrics.

Board Certified: Family Medicine
Family Medicine Residency Training: St. Elizabeth Medical Center, Dayton,
OH Medical Degree: The Ohio State University College of Medicine,
Columbus, OH Bachelor of Science: University of Dayton, Dayton, OH

William J. Randall, MD

Board Certification: Family Medicine
Family Medicine Residency: St. Elizabeth Medical Center, Dayton, OH
Medical Degree: University of Cincinnati College of Medicine, Cincinnati, OH
Bachelor of Science: University of Dayton, Dayton, OH

Gilbert W. Templeton, MD, FACC

Board Certified: Internal Medicine, Cardiovascular Disease
National Board of Medical Examiners (Diplomat)
Fellowship in Cardiovascular Disease: Naval Hospital, Philadelphia, PA
Internal Medicine Residency: Naval Hospital, Philadelphia, PA
Medical Degree: Temple University School of Medicine, Philadelphia,
Bachelor of Science: Ursinus College, Collegeville, PA