Mark Brewster
President: Brewster Ambulance & CMTI

Mark Brewster is the President of Brewster Ambulance Service and Comprehensive Medical Teaching Institute. The ambulance service has been in Mark’s blood since he was a kid—he started out sweeping floors and then worked his way to learn every aspect of the business and made it into a career. By 1993, Mark was an operations supervisor for the company and managed daily operations for 45 ambulances and 170 crew members in Brewster Ambulance Service’s South Division with three 911 systems.

Mark’s latest growth included the purchase of Comprehensive Medical Training Institute in 2016 to expand Brewster's in-house training capabilities and also have the ability to offer Emergency Medical Technician and Paramedic programs to all employees. 


Keith Wilson
Chief operating officer

Keith is the Chief Operations Officer for Comprehensive Medical Teaching Institute(CMTI) and has held that position since he started the company in 2009. Keith has been in the EMS industry for over 25 years as a field paramedic for Boston EMS, Brewster Ambulance Service and he also provides EMS Leadership as a career Fire Lieutenant in the Fire Service. Keith is a graduate of UMBC Critical Care Para-medicine Program, Cape Cod Community College and has also attended the University of Richmond’s Emergency Service Management Program. Keith holds multiple EMS teaching credentials.

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Gary Smith, REMT-B
Director of Operations

Gary has been with CMTI since it first opened its doors in 2009 and has been Director of Operations for the past 8 years. He has been involved with EMS for almost 40 years starting his career with the Hanson Fire Department in 1980. Gary spent 35+ years with the department, 20 as the EMS Coordinator and 18 as a Lieutenant, before retiring in 2015. During his time as EMS Coordinator he was instrumental in advancing the department’s EMS service from the basic life support level to the advance life support-paramedic level. Gary was awarded the Old Colony/Plymouth EMS EMT-I of the Year award in 2001.

Gary has been married to his wife Debbie for the past 40 years, has two sons that are Firefighter/EMT-P’s, a daughter that is an Emergency Room Nurse and six grandchildren  


Dr. Daniel Muse
Chief Medical Officer

Dr. Muse is a board-certified emergency physician who has over 30 years of experience in the field.  He has been practicing at Signature Healthcare Brockton Hospital for the last eleven years.  Dr. Muse has also served as EMS medical director overseeing 13 departments and agencies.  For the last five years, he has assisted the local district attorney’s offices in advising and training law enforcement agencies in the use of nasal naloxone.  This initiative was recently extended to school nurses and trainers in the Plymouth, Norfolk and Middlesex County communities.  Dr. Muse also works with local communities speaking on the issue of substance abuse at schools and community organizations.  For the last four years, he has also served as medical advisor for the Municipal Police Training Center.

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Cheryl Agnew
Education Manager

Cheryl has been in EMS for almost 20 years. She did 3 years on the Ambulance then 17 years as a dispatcher. Cheryl joined the CMTI family in 2017 as the Education Coordinator. 


Juvy Hartweg
Instructor Staff

Juvy is a Biology/Physics and General Science teacher, After 18 years of teaching K-12 Science, I was thrilled to join CMTI as an Anatomy and Physiology Instructor To be able to experience education across the ages and explore Science curriculum for adults has been professionally rewarding. It has given me an opportunity to appreciate the work and effort that adult learners need to put in place so they can balance the demands of both their professional and personal life.

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Ryan Hickey
Instructor Staff

Ryan has been working in EMS since 2005. He worked for a private company on the north shore before being hired as an EMT at Boston EMS in 2007. He got his Paramedic certificate at Northeastern University In 2012, and have worked as a Paramedic at Boston EMS since 2014, where he is currently an ALS and BLS Field Training Officer. He is also AHA BLS, ACLS, and PALS Instructor. Ryan is also a Certified Tactical Paramedic and MA State EMT Examiner. Ryan has been with CMTI as an instructor since May 2018. 

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Joseph Cleary
Instructor Staff

Joseph is enthusiastic and has a deep passion to meet new faces in The EMS Family.He Enjoys learning from peers and assisting in their success. With 20 years in Fire-service expierence as well as 10 years in Private EMS, 14 years in Education with fellow health care providers at BMC, Medical Facilities and EMT education facilities and finally 15 years as an OEMS State Examiner.

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Edward Hennegan
Instructor Staff

Ed started his EMS career in 1979, He has worked in both the private and municipal sector. Also worked for Boston EMS rising to the rank of Captain. After Boston EMS, He then went on to work for the Commonwealth of Massachusetts Department of Public Health Office of Preparedness and Emergency Management as a planner. Ed has been an Instructor Coordinator and a State Examiner for more then 32 years. 

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James Neenan
Instructor Staff

James is a current Mass EMT-P / over 40 years in Fire/ EMS  / Bachelor of Science degree / have been with CMTI since  2015 .

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Stephan O’Sullivan
Instructor Staff

Stephan has been with CMTI since May 2018 primarily teaching in paramedic program. EMT since 2000, RN since 2005 and Paramedic since 2008.  Prehospital experience in fire based and commercial EMS.  Hospital experience in emergency, ICU, pediatrics and trauma.

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Erica Mayo
Instructor Staff

Erica is Currently certified as an EMT-B and Is a a Field Training Officer for my company. She has been in EMS education for the last few years and with CMTI for a year. Other certifications include CPR instruction and my BLS Instructor Coordinator certificate.

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Sean Hannegan
Instructor Staff

Sean currently works for the City of Boston as an emergency medical technician EMT and have been employed there for eleven years full-time. Sean has been working with CMTI for 3 years. He takes his education, experience and knowledge that he has from my full-time employment with Boston, per diem position with Brewster ambulance and his educational experience he has acquired from Quincy college and university of Massachusetts Boston and brings it with him to every educational teaching moments with CMTI. Not only does Sean teach students who are looking for an awarding career in ems, but still learns from senior instructors in this fine institution 

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Christopher Stratton
Instructor Staff

Chris is currently certified as an EMT-Paramedic.  Chris has been involved with pre-hospital emergency care since 1975 starting with the Boston Ambulance Squad; He worked for several private ambulance companies including Brewster Ambulance; and also worked for and retired from the City of Boston EMS after 34 yrs of service.  Chris has been with CMTI since 2012 currently working as an Instructor.


John Belcher
Instructor Staff

John began his EMS career in 1992 at Brewster Ambulance.  Additionally he has worked for other agencies in the metro-Boston area.  He returned to Brewster in 2015.  In addition to working per diem in the Quincy area he consults on areas of CQI and Education. He is a graduate of Northeastern University with an Associates in Paramedic Technology along with a BS in Health Sciences. He is currently working on a Masters in Leadership.  Over the years he has taught many educational programs for both EMS and hospital staff alike.  He previously was an adjunct instructor at Northeastern University's Paramedic Program.  

He has additional experience in the hospital collaborating with surgeons to evaluate potential organ donors.  In this capacity he has extensive experience with mechanical ventilation, hemodynamic monitoring modalities and resuscitation.  He is a frequent lecturer in the field of organ donation.  He has served on the Board of Directors for two different related non-profit organizations.