your MS care team

Employees of The Elliot Lewis Center standing outside

your MS care team

Joshua Katz, MD

Dr. Joshua Katz is the Co-Director of The Elliot Lewis Center and a nationally recognized expert in multiple sclerosis, neuromyelitis optica, MOG associated disease, and transverse myelitis. He is well known for his focus on comprehensive care and his sophisticated approach to the diagnosis and treatment of multiple sclerosis. He 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 doctor and patient. He believes it’s important to know the whole person, not just their illness. He is devoted to guiding his patients through the many complex aspects of MS, from 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 has 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 a current member and 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 dog Jackson, as well as enjoying cooking, photography, skiing, and running (not so much the running).

Dr. Joshua Katz
Dr. Andrew Bouley

Andrew Bouley, MD

Dr. Andrew Bouley 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 actively serves as a member of the National Multiple Sclerosis Society’s Northeast Healthcare Provider Council. 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. He participates in several clinical trials involving multiple sclerosis treatments. He has been invited to speak at several regional meetings discussing advancements in multiple sclerosis therapies, and he has presented his research at both national and international multiple sclerosis conferences.

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 is extremely busy with his two young sons. When (and if) he has free time, he enjoys running, hiking, skiing, and reading.

Ellen Lathi, MD

Dr. Ellen Lathi is the founder of The Elliot Lewis Center. She is a well-known speaker on treatment issues and wellness in multiple sclerosis. She has participated in numerous clinical trials related to the treatment of multiple sclerosis and is widely recognized for her clinical expertise and comprehensive, personalized approach to patient care. She believes that the relationship between the patient and physician should be an intimate one, in which there is an ongoing dialogue about every aspect of the patient’s life as well as in-depth patient education.

A  board-certified neurologist since 1980, Dr. Lathi has been recognized as a teacher of residents and medical students at Tufts University. She is the founder of the MS Service Dog Program, sponsored by the National Multiple Sclerosis Society, in which Labrador retrievers were trained to assist disabled patients with MS. She has repeatedly been one of Boston Magazine’s “Best Doctors” and one of US News and World Reports’ “Top Doctors.” She was inducted into the MS Hall of Fame and received the Physician Health Care Professional award from the National MS Society in 2018 and was the 2021 recipient of the NMSS Hope Award for Lifetime Achievement. She is a member of the American Academy of Neurology, past chair of the Clinical Advisory Committee of the Greater New England Chapter of the National MS Society, past member of the National Advisory Committee of the NMSS, and a member of the Consortium of Multiple Sclerosis Centers.

When she is not in the office, she loves spending time with her two children and four granddaughters, as well as designing and working in her garden oasis and training her Labrador retrievers in a variety of dog sports.

Dr. Ellen Lathi
Marissa Shackleton

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 .

Amanda Walsh

Amanda Walsh, RN BSN, Infusion Nurse

Amanda has been part of the ELC team since 2018. She is currently our part-time infusion nurse. Amanda graduated from Fitchburg State University in 2012 with her Bachelor’s Degree in Nursing. After graduating, Amanda worked as an Emergency Department nurse in New Hampshire before transitioning to Beth Israel Deaconess Medical Center where she worked in both the Emergency Department and Cardiac ICU. Amanda enjoys working closely with and supporting patients through their treatment and learning about advancements in MS care. Outside of work Amanda is a mom to two young children and enjoys spending time outside.

Kate McCusker

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.

Valerie Willocq

Valerie Willocq, Clinical Assistant

Valerie has been the Clinical Assistant at The Elliot Lewis Center since 2021. She has a degree in Biology from Tufts University. Prior to working at ELC, Valerie was a research assistant. You can find Valerie in the office administering functional testing for multiple sclerosis, processing authorizations for disease-modifying therapies and drawing labs.

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Meg Fearey, Clinical Research Coordinator

Meg joined The Elliot Lewis Center in 2023 as a Clinical Research Coordinator. She graduated from Middlebury College in with a degree in Neuroscience and minor in global health. After graduating, she worked as a research assistant at Boston Children's Hospital on a project studying executive functioning in infants. She is passionate about clinical neuroscience research that can be used to better the lives of patients. In her free time, she coaches field hockey and runs a small Etsy business.

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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.

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Sam Stine, Clinical Research Coordinator

Sam joined the Elliot Lewis Center in 2024 as a Clinical Research Coordinator. Sam graduated from The University of the South in 2018 with a BS in psychology and then completed her MS in Drug Discovery & Development from Drexel University’s College of Medicine in 2022. Sam conducted preclinical neuroscience research for her thesis. She investigated if women recovering from alcohol use disorder are at an elevated risk for developing binge eating disorder potentially due to changes in reward circuitry. Prior to joining ELC, Sam worked in clinical data management at a small biotech company developing oncolytic viral immunotherapies. She is passionate about expanding access to quality healthcare and the development of better treatment options to improve patients’ quality of life. In her free time, Sam loves to bake, garden, read, and spend time with her dog and two cats.

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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.

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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.

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Charlotte Hewson, Administrative Assistant

Charlotte is an Administrative Assistant at The Elliot Lewis Center. She has a Bachelor’s degree in social work from Syracuse University, where she found her passion for working to resolve systemic inequity. Upon moving to Boston, she was looking to help others in a work environment that was supportive to her as well, which is exactly what she found at ELC. She's incredibly proud to be part of such a well-rounded and intelligent team. Charlotte enjoys sitting at the front desk because it gives her a chance to see the friendly faces that she speaks with on the phone.

When she's not at work you can find her looking for her next read, walking in the park, doing the weekly people magazine crossword, or snuggling with her beloved 20-year-old cat Madeline. Charlotte is so thankful for all the amazing opportunities ELC has granted her so far and cannot wait to see what the future holds!