Our Staff

Medical Director
Robert K. Orr, Jr. D.O. FACEP
Dr. Orr has been Tri-County’s Medical Director since 1992; he also served as Medical Director from 1985 to 1989. Dr. Orr is a former paramedic, and is a graduate of the National EMS Medical Directors Course. He is “Board Certified” in Emergency Medicine by the American Board of Emergency Medicine. Additionally, he is a “Fellow” of the American College of Emergency Physicians and is a member of the ACEP Michigan Chapter. Dr. Orr has served as Medical Director for numerous EMS education programs, advised the State of Michigan on use of AED’s in State vehicles and buildings, and is active in many other emergency medicine related pursuits. In 2016, the Michigan College of Emergency Physicians honored Dr. Orr by awarding him with the Emergency Physician of the Year Award for his Emergency Medicine and Pre-Hospital Care Commitment. In his spare time, Dr. Orr is an attending physician at McLaren Greater Lansing Hospital.


Manager of Operations
Michelle Harper, EMT-P, BAS
Michelle brings over 30 years of EMS experience to Tri-County as Manager of Operations, a position she has held since 2003. Michelle began her work at TCEMCA in 1999. Previously, she served her community as a volunteer with the Delhi Township Fire Department as an EMT, EMT-Specialist, and as a Paramedic. Additionally, Michelle possesses fifteen years of experience in the banking industry, where she rose to the position of Vice-President at a major Lansing-area Credit Union. Michelle, a graduate of Siena Heights University, is also an active member of several State and local EMS committees.


CQI Coordinator
Mark A. Vroman, EMT-P
With over 20 years of EMS experience, Mark has held the position of CQI Coordinator for TCEMCA since 2005. Along with his duties at Tri-County, Mark is a Battalion Chief with the Meridian Township Fire Department. In addition to an undergraduate degree in Public Safety Studies from Siena Heights University and a graduate degree in Business Administration from Davenport University, Mark possesses advanced certifications in a wide array of emergency service disciplines.


Administrative Assistant
Melissa Chamberlain, EMT-P
Melissa joined TCEMCA in April 2016. Melissa brings over 8 years of EMS experience to the TCEMCA office. She has worked as a paramedic in both Livingston County MCA and Tri County Emergency MCA. Melissa also holds Firefighter 1 & 2 Certifications, and has served as a firefighter.


Linda Giffen
Linda joined TCEMCA in April 2018. Linda brings to us many years of experience with Receptionist/Front Desk Coordinator type roles. Please offer Linda a warm welcome to our team.