Our Leadership Team
Laura Dinsmore, MS, MA
Founder, CEO and President
Laura Dinsmore incorporated Quadrant in 1997 following 35 years of experience in every facet of occupational and environmental medicine – as consultant, healthcare provider, and corporate executive. Laura loves dancing and the word “jocularity.”
Britt Hunter Hatfield, MD, MBA, MPH, FACOEM
Chief Medical Officer
A Fellow of the American College of Occupational and Environmental Medicine, Dr. Hatfield has 15+ years experience practicing occupational medicine and directing medical centers. He is a Medical Review Officer (MRO) and certified FMCSA Examiner. He holds graduate degrees from Harvard, Columbia, and the University of Tennessee. Britt loves skiing and swimming when he’s not doctoring.
Brian Morris, MD, JD, MBA, MPH
Corporate Medical Director
Dr. Morris is board certified in Occupational Medicine and Legal Medicine. He holds graduate degrees from Brown, Harvard, Yale, and the New England School of Law. The recipient of the 2014 MA State Police Lifesaver Award, Dr. Morris is also an MRO and a member of the FMCSA (Federal Motor Carrier Safety Administration) Medical Review Board. Dr. Morris is an avid Three Stooges fan.
David M. Roston, MD
Medical Director New England Region
Dr. Roston is Board Certified in Internal Medicine. He has practiced Occupational Medicine for 28 years, developing expertise with employees and workplace issues from the complete range of local and global work organizations. He is an MRO and certified FMCSA Examiner. Dr. Roston is also an active outdoor sports practitioner.
Anna Hathaway, CPA, PFS, MST
Chief Financial Officer
Anna is a Certified Public Accountant with over 20 years of accounting and finance experience. A specialist in taxation, she oversees Quadrant’s finances, risk management, and human resources functions. Anna enjoys woodworking and the smell of freshly cut wood.
Kathleen Wilhelmsen, RN, BSN, CCM
VP, Global Program Management
With over 30 years of occupational health experience, Kathleen is responsible for the overall management of onsite occupational health and well-being clinical services. In collaboration with Quadrant’s CMO, she oversees our onsite medical teams. Kathleen is a big-time connoisseur of lemon caper grey sole and chocolate.
Mary Riley, PT
VP, Ergonomic Program Management
A licensed physical therapist with 30+ years experience, Ms. Riley has consulted with more than 150 organizations in every industrial sector. Possessing a well-deserved reputation as a master trainer, she specializes in Injury Prevention Programs (worksite job analysis, workstation assessments, ergonomic training) and Treatment Services, May is a dedicated Penguin (a ski club).
Holly Dinsmore, MSM
VP, Business Development
Holly has extensive leadership experience, overseeing the development, implementation and support of clinical software systems, including EMR, Physicians Order Entry and Occupational Health. Holly’s responsibilities range from corporate IT development to operations management of our Beverly flagship site. She is also a beach bonfire specialist.
David Frances, PhD
VP, Training & Development
For 32 years prior to joining Quadrant, Dr. Frances was CEO of a major EAP firm. A clinical psychologist, he has provided training, consulting, and executive coaching services for hundreds of organizations nationwide. His book, This is a Safety Moment, helps employees give feedback respectfully to co-workers who behave unsafely. David is also a parallel parking expert.
Director, Client Services
Diane Talbot has nearly 20 years of experience, specializing in Occupational & Environmental Health & Safety. Her role includes client services, sales, marketing, consulting with the business community, assisting with implementation of occupational health programs, and on-going client relations. Diane likes chocolate chips in almost everything.
Director, Business Development
Rich possesses over 20 years of business development experience, nine of which involved occupational and environmental health and safety. Rich focuses on collaboration and customizing solutions for every client’s unique business challenges. Rich is also a proud member of Parrot Head Nation and was at Fenway when Carlton Fisk hit his famous 1975 World Series homer.
Director, Research Donor Programs
An ASCP-certified phlebotomist, with an extensive background in Electronics Technology, Carol has more than 10 years experience directing Quadrant’s research donor programs globally in addition to managing donor programs onsite at client companies. She admits that she encourages her grandchildren to jump on the bed!
Director, Atlantic Region Research Donor Program
With over 15 years of experience in the medical field, Michael has worked with hospitals, doctors, and pharmaceutical companies in both clinical and administrative settings. An experienced phlebotomist, he is responsible for managing the research donor programs at Quadrant’s mid-Atlantic locations. Michael owns three fanny packs and is not afraid to use them.
Lisa Patnaude, RN
Manager, Clinical Development
Lisa has 20+ years of diverse clinical nursing experience, including emergency care, episodic urgent care, injury and illness management, travel medicine, case management, OSHA record keeping, wellness initiatives and research blood donor programs. Lisa’s role as manager of clinical development ensures best clinical practice in our occupational health offices. Lisa loves gardening and the Patriots.
Manager, Global Research Donor Programs
Michele is a licensed phlebotomist with more than ten years experience managing projects and delivering medical services at major pharmaceutical companies. She possesses a key role in developing new RDP projects for international clients. Michele is a proud member of Red Sox Nation.
Sarah A. Wonson, CMA, BSM
Manager, Medical Records
Sarah has been with Quadrant since 2009, initially as a Certified Medical Assistant. After receiving her bachelor’s degree in Healthcare Management she was promoted to her current position where she is responsible for managing all medical records and for communicating medical results to client companies. She enjoys cruises and playing with her adorable cat, Lola.
Amy has over 25 years of administrative experience in the healthcare industry. Her primary role is assisting clients with prompt attention to ensure their needs are met in a timely and accurate manner. Amy’s role includes managing all aspects of the administrative team operations ranging from scheduling appointments to ensuring proper protocols are met. Amy is also a watercolor specialist.