your MS care team
your MS care team
Joshua Katz, MD
Dr. Joshua Katz is the Director of The Elliot Lewis Center and a nationally recognized expert in multiple sclerosis, neuromyelitis optica, MOG associated disease, and transverse myelitis. He is recognized for his focus on comprehensive care and his sophisticated approach to the diagnosis and treatment of multiple sclerosis and sees patients in consultation from the entire New England area and beyond.
Dr. Katz believes that the best care is achieved through a close relationship between the doctor and patient and believes it’s crucial to treat the whole person, not just their illness. He is devoted to guiding his patients through the many complex aspects of MS, from understanding what MS is, making informed treatment decisions, to the impact on one’s personal life.
Dr Katz is the founder of the nationally acclaimed “MS Faculty Conference,” where MS experts from all the New England states convene on a quarterly basis to discuss controversies in MS and challenging cases.
He is active in clinical research on multiple sclerosis and is an investigator in numerous ongoing clinical trials.
Dr. Katz graduated from Tufts University School of Medicine and completed his neurology training at Tufts Medical Center. He also trained for several years in psychiatry and completed a neuro-ICU fellowship at St. Elizabeth’s Hospital in Boston. He received multiple awards from Tufts Medical School for his skill and dedication to teaching. He is an Assistant Professor of Neurology at Tufts Medical School, a board-certified neurologist since 1999, and a member of the American Academy of Neurology. He is past chair of the clinical advisory committee of the New England Chapter of the National MS Society and a member of The Consortium of Multiple Sclerosis Centers.
When not hard at work he loves spending time with his wife and daughter and dogs Jackson and Zeta. He enjoys cooking, photography, skiing, and running (not so much the running).
Andrew Bouley, MD
Dr. Andrew Bouley is the co-Director of The Elliot Lewis Center and has been a board-certified neurologist since 2017, as well as a member of the American Academy of Neurology and the Consortium of Multiple Sclerosis Centers. He has participated in many clinical trials involving multiple sclerosis treatments, some of which are ongoing. He has presented research at several multiple sclerosis conferences.
His training includes medical school at Duke University, neurology residency at Brown University/Rhode Island Hospital, and a neuroimmunology/multiple sclerosis fellowship at Beth Israel Deaconess Medical Center.
Dr. Bouley truly values a doctor-patient team approach; he strives to make shared decisions with patients that honor their individual goals of care. He aspires to form enduring and meaningful relationships with his patients for years to come.
Outside of work, he stays busy with his two young sons and enjoying the outdoors!
Marissa Shackleton, MS, Executive Director
Marissa is the Executive Director at The Elliot Lewis Center. She manages the day-to-day operations of the practice. She directs all aspects of the infusion center, supervises the clinical research program and manages the business. She has been part of the MS Center Team since 2011.
Marissa has a Bachelor of Science in Biology, concentration in neuroscience, from Boston College and a Master of Science in Health Communication from Boston University. Marissa is particularly passionate about access to care and affordable treatment for patients. She strives to educate patients and practitioners on health insurance, overcoming barriers to treatment and financial assistance options.
Marissa is a national speaker on access, reimbursement, infusion centers, site of care, and practice management. She serves on the board of directors for the Infusion Access Foundation, and is an active member of advisory board for the National Infusion Center Association. Additionally, Marissa is the Director of Development and board member for The ELC Foundation, a nonprofit organization developed to assist patients with multiple sclerosis and their families.
Outside of the office, Marissa is an alumna of the Marathon Strides Against MS Team; she ran the Boston Marathon in 2017, 2018 and 2019, raising over $45,000 for the National Multiple Sclerosis Society.
Alexandra Potts, RN BSN MSCN, Infusion Nurse
Alexandra is a full-time infusion nurse at The Elliot Lewis Center. Alexandra graduated from the University of Rhode Island in 2016 with a Bachelor’s Degree in Biological Sciences. Following graduation, she joined The Elliot Lewis Center team as the Clinical Assistant through 2019. In 2019 Alexandra left the ELC to pursue her nursing degree through the MGH Institute of Health Professions. After earning her Bachelor’s Degree in Nursing she worked as a RN on a Neuroscience/Oncology unit at Massachusetts General Hospital. Alex re-joined ELC in 2022. Her favorite part about working at ELC is cultivating relationships with patients and working alongside the research team with the latest MS infusion treatments. In her free time she enjoys adventuring with her dog, trying new restaurants around the city, and going to Red Sox games.
Cassandra Smith, RN BSN MSCN, Infusion Nurse
Cassandra is a full-time infusion nurse at The Elliot Lewis Center. Cassandra graduated from Curry College with her Bachelors degree in Nursing in 2015. She worked for 5 years as a nurse at St. Vincent's Hospital in Worcester on medical-surgical and orthopedic units. She then relocated to South Shore Hospital in Weymouth on a medical-surgical telemetry unit for 2 years before joining ELC. In the hospital, Cassandra often acted as charge nurse and had many opportunities to precept new nurses and nursing students, which she enjoyed. In her free time she enjoys hiking the White Mountains, going to the beach, and spending time with family, friends, and her dog .
Kate Stevens, Infusion Coordinator
Kate joined The Elliot Lewis Center in 2017 as the infusion coordinator. She is responsible for coordinating all aspects of the insurance coverage and financial assistance programs for patients with multiple sclerosis on infusion therapy.
Following her graduation from New England college in 2011 with a BS in psychology, she entered the healthcare field in her hometown of North Conway, NH where she gained administrative experience before moving to the Boston area. Kate’s favorite part of her job is learning about disease modifying therapies and building relationships with patients. She is thrilled to work with such a motivated and supportive team and looks forward to the promising future of The Elliot Lewis Center. In her spare time, Kate enjoys being outdoors, cooking, and spending time with family, friends, and her dog.
Olivia Tighe, Clinical Assistant
Olivia is the Clinical Assistant at The Elliot Lewis Center, where she performs functional testing for multiple sclerosis patients, draws labs, and initiates patient authorizations for disease-modifying therapies. She is a graduate of Florida State University with a Bachelor's degree in Public Health and a minor in Biological Sciences. Prior to working at ELC, she had experience providing patient-centered care as part of healthcare teams in both hospital and outpatient settings. She worked on a cardiac floor, primarily with heart failure patients, and also served as the lead medical assistant in an outpatient ENT clinic.
Passionate about holistic care and improving healthcare outcomes, Olivia is working towards returning to school to become a Physician Assistant. In her free time, she enjoys staying active, practicing reformer pilates, traveling to new destinations, and spending quality time with loved ones. Olivia is excited to be part of the ELC team and make a difference in the lives of MS patients.
Paige Greenawalt, Clinical Research Coordinator
Paige joined the research team at The Elliot Lewis Center in 2022, after graduating from Boston College with a degree in Neuroscience. Prior to joining the ELC team, Paige worked in healthcare administration, where she assisted with patient operations and updating companywide workflows. During her time at Boston College, she worked on various research projects in cognitive neuroscience. In the future, Paige hopes to continue her career in neuroscience, either by pursuing a graduate degree and/or working in pharmaceuticals.
Paola Castro Mendoza, Clinical Research Coordinator
Paola joined The Elliot Lewis Center in 2024 as a Clinical Research Coordinator. She graduated from Boston University with her BS in Psychology and Neuroscience in 2018 and her MS in Anatomy & Neurobiology in 2022. Before joining ELC, she worked as a Clinical Research Coordinator at Massachusetts General Hospital’s Pediatric MS Center and later as a Research Technician at Boston University’s School of Medicine studying differences between specialized areas of the brain in a non-human primate model. In her spare time, Paola enjoys making her way through her never ending to-be-read pile of books.
Isabelle Messina, Clinical Research Coordinator
Isabelle joined The Elliot Lewis Center in 2025 as a Clinical Research Coordinator. She graduated from Boston University with her BS in Human Physiology and a minor in public health in 2022, and her MS in Human Physiology in 2024. Before joining ELC, she worked at Boston University School of Medicine in multiple departments for research regarding longevity, neurobiology, and epilepsy. Isabelle has also worked in direct patient care as an EMT during the COVID-19 pandemic. In her spare time, Isabelle enjoys engaging with her local community through volunteering, spending time with family and friends, and traveling to new places around the world.
Dalin Trivella, Administrative Coordinator
Dalin is the Administrative Coordinator at The Elliot Lewis Center. She has a bachelor’s degree in Exercise and Health Sciences from University of Massachusetts Boston. Before joining ELC, Dalin worked at Brigham Women’s Hospital as a practice coordinator. She loves helping patients, assisting with their needs, and developing long lasting relationships.
Dalin has always had a passion for helping others, so much so that she became a Zumba and Spin instructor at the Oak Square YMCA, where she helps people maintain a healthy lifestyle. She is extremely excited and proud to be part of the ELC team, and to work alongside a dedicated, intelligent, and motivated team. In her free time, Dalin loves to spend time in nature, with family, and with her dog Charlie.
Dona Varghese, Administrative Assistant
Dona is an Administrative Assistant at The Elliot Lewis Center. She graduated from College of the North Atlantic-Qatar with Bachelor of Applied Science in Respiratory Therapy. Her experience working as an intern in the ICU at the Hamad Medical Corporation, instilled a passion for the medical field. Before joining ELC, she worked as a Finance Counselor at Parkland Health and Hospital System, Dallas where she assisted patients, especially those from economically challenged backgrounds to access financial assistance.
Dona enjoys helping patients, and reducing their anxieties in their medical care journeys. She is excited to be a part of the ELC team, and looks forward to learning and growing with the dynamic team.
Renay Beers, Administrative Assistant
Renay is an Administrative Assistant at the Elliot Lewis Center, where she brings over a decade of experience in the medical field. Guided by a deep sense of compassion, Renay is dedicated to providing care that addresses both the emotional and physical needs of patients. Her empathy is the cornerstone of her approach, ensuring that every patient feels valued and understood. With a natural talent for multitasking and exceptional organizational skills, Renay skillfully manages complex schedules, coordinates between departments, and maintains a smooth and supportive environment. Outside of work, Renay cherishes time spent with her four beautiful daughters, enjoys exploring new destinations, indulges in shopping, and loves trying new things.
Natalie Medeiros, Administrative Assistant
Natalie Medeiros is a dedicated Administrative Assistant with a deep passion for the medical field. She graduated from UMass Lowell with a degree in Health Sciences and a minor in Nutrition, providing her with a comprehensive understanding of health and wellness. Natalie’s previous experience at Massachusetts General Hospital in physical therapy has further fueled her commitment to patient care. Her strong organizational skills and enthusiasm for the medical field make her an invaluable member of our team. When she's not working, Natalie enjoys relaxing with Netflix, traveling, and spending time with loved ones.