Faculty & Staff

Rebecca Collins, DO Program Director

Rebecca Collins, DO, MPH, FAAFP, CPE is the new program director of the Northwell Health Phelps Family Medicine Program.  Dr. Collins completed her family medicine training at Columbia University’s Center for Family and Community Medicine, medical school at Kirksville College of Osteopathic Medicine and public health training at A.T. Still University.  She is one of the founding faculty members of this residency program.  Over the course of her career in both academic and community health center administration, she has concentrated her work efforts on providing high quality, comprehensive healthcare to underserved communities. Dr. Collins has led administrative and clinical care teams to improve care delivery, collaborate across disciplines, increase access to care and expand clinical services.  One of her recent sources of joy in practice has come from using motivational interviewing to provide medical assisted treatment for those with substance use disorders. She is a passionate advocate for a comprehensive, compassionate, biopsychosocial approach to family medicine. Dr. Collins finds meaning in teaching and mentoring, practicing medicine in Spanish, and fostering clinical curiosity in care teams. She is excited to be starting this new endeavor with the support of an outstanding faculty and administrative team. She resides with her husband and 3 daughters in Westchester, NY.  

London Muse, MD Associate Program Director & Medical Student Clerkship Director

Dr. London Muse, originally from Des Moines, Iowa, completed her undergraduate degree at the University of Notre Dame in Indiana in 2008, her medical education at New York Medical College in Valhalla, NY in 2012, and her family medicine residency training at Phelps in 2015.  She was one of the chief residents of the first graduating class and has long had a passion for teaching. She was a two time recipient of the Society of Teachers of Family Medicine Resident Teacher Award during residency.  After learning Spanish during her residency and providing exceptional care of the underserved in our patient centered medical home, Open Door Family Medical Centers, she elected to join the practice as a full-time faculty physician in August 2015.  Given her interest in teaching future doctors, she became the medical student clerkship director, while continuing to regularly teach at New York Medical College’s Foundations of Clinical Medicine courses.  She completed the Emerging Leaders Fellowship through the Society of Teachers of Family Medicine and subsequently became the medical director at Sleepy Hollow Open Door in January 2017.  In 2019, she began training in the Program Director Development Fellowship with the Association of Family Medicine Residency Directors.  She now resides in Ossining, NY with a lovely view of the Hudson River as her back yard! Dr. Muse enjoys, travel, seeing family and concerts.

Samantha Rai, MD Associate Program Director

Dr. Samantha Rai earned her undergraduate degree from Brown University and her medical degree from Tufts University School of Medicine. She completed her residency training and served as a chief resident at the Santa Rosa Family Medicine Residency Program, an affiliate of the University of California, San Francisco. She worked at a community health center in Northern California and taught at the Santa Rosa residency program before returning to New York. In 2005, she joined the Open Door Family Medical Center, seeing patients at the Mount Kisco site and later serving as the medical director for clinical quality for the entire organization as well. Committed to the diverse and underserved patient population she cares for, Dr. Rai believes strongly in the importance of the doctor-patient relationship and in the ability of family physicians to provide high quality, affordable care that is based on up-to-date clinical evidence and guidelines. Inspired to share her passion for family medicine, Dr. Rai joined the Phelps Family Medicine Residency Program faculty in 2014. She lives in Tarrytown, NY with her husband (who is also a family physician) and two daughters.

Mary Rose Puthiyamadam, MD Faculty & Pediatric Curriculum Coordinator

​Dr. Mary Rose Puthiyamadam earned her medical degree from the State University of New York at Buffalo after earning her BS in Health Sciences and a BA in Child Development from the same institution. Dr. Puthiyamadam is double board-certified in pediatrics and internal medicine and completed her residency at the Penn State Hershey Medical Center in 2003. She joined Open Door Family Medical Centers in 2003 and practiced at the Ossining location until 2010. She subsequently began working in Open Door’s Sleepy Hollow location and became founding faculty of Phelps Family Medicine Residency Program in 2011. As pediatric curriculum coordinator for the program she oversees pediatric inpatient, outpatient and pediatric emergency department rotations.

Dr. Puthiyamadam committed to providing exceptional healthcare to underserved patients and is passionate about quality improvement and community engagement: she leads a grant through CHCANYS intended to combat pediatric obesity state-wide and has spearheaded a variety of community projects including community supermarket tours and portion plates. Dr. Puthiyamadam also mentors residents to identify and pursue their interests academically through the development of numerous poster presentations and workshops that have been presented locally and nationally. She regularly presents and speaks at national conferences about her community health initiatives and has worked internationally in Africa and India.

Rebecca McAteer, MD Faculty & Global Health Advisor

Dr. McAteer is a graduate of the College of William and Mary, and received her doctorate from New York Medical College (MD). She completed residency training in family medicine at Lancaster General Hospital in Pennsylvania with an area of concentration in palliative care/ hospice. She went on to do a faculty development fellowship at Georgetown University, where she focused on bioethics and medical humanities. In addition to working for several years as an attending hospitalist, Dr. McAteer also served as a full-spectrum family physician at Tansen Mission Hospital in rural Nepal from 2013-15, before accepting her present faculty position with the Phelps Family Medicine Residency Program. She is the project director of a five-year HRSA K02 faculty development grant, “Creating Future Clinician Educators,” which was awarded to the residency program in 2017.

As a family physician, Dr. McAteer is committed to providing excellent, compassionate care to underserved patient populations in our local Westchester community. She is also involved in various global health initiatives to extend that quality of care to vulnerable populations in the developing world. Dr. McAteer is passionate about cultivating interest in the vocation of medicine among students and residents, as well as fostering resilience and reflective practice through the use of the arts and literature alongside colleagues and staff.

Sara Paul, MD Faculty & Women’s Health Curriculum Coordinator

Dr. Sara Paul is originally from Phoenix, Arizona and completed her undergraduate degree at the University of California, San Diego. She lived in England for one year prior to attending medical school at Ross University in Dominica, West Indies.

Dr. Paul is dedicated to serving the underserved and has volunteered with numerous community outreach programs during her clinical rotations, in addition to having an active involvement in Global Health initiatives. She has attended multiple international medical trips and worked alongside Dr. Rebecca McAteer in establishing the program’s Global Health rotation in the Dominican Republic. She has always possessed a keen passion and special interest in Obstetrics and Women’s Health, and completed a Fellowship in Obstetrics at Lincoln Medical and Mental Health Center in the Bronx, NY. In addition to being the Women’s Health Coordinator for our program, she is the lead coordinator for the Northwell Department of Family Medicine Women’s Health Track for the Northwell Family Medicine Residency Programs. She is currently working on becoming an HIV specialist to provide care for those in need at Sleepy Hollow Open Door.

An alumni of Phelps Family Medicine Residency Program, Dr. Paul graduated with our first class and served as one of the program’s first chief residents. She had such an exceptional experience as a resident at Phelps that she decided to return to join our faculty after graduating fellowship.

Disha Shastry, MD Faculty

Dr. Disha Shastry is originally from Franklin, Massachusetts, lived in India during high school, then became a New York State transplant. She is a graduate of Rensselaer Polytechnic Institute where she studied biology and music, then completed her medical degree at SUNY Downstate College of Medicine in Brooklyn, NY followed by family medicine residency training at Phelps. 

 While in residency, she developed an interest in teaching and was a recipient of the STFM Resident Teacher Award. She also worked closely with Dr. McAteer and Dr. Paul in establishing the Global Health track and became the first resident of the program to complete this track. She has done medical work abroad in the DR, Kenya, Haiti, and India and hopes to continue with global health work in the years ahead. After residency, she decided to join as full-time faculty to remain involved in medical education and stay committed to providing culturally-sensitive care to the wonderful patient population at Open Door. 

Outside of work, she enjoys playing flute, traveling, practicing yoga, photography, taking nature walks, spending time with friends and family, and eating chocolate.

Allison Smith Greenberg, Faculty


Cheryl Aguilar Training Program Administrator

Ms. Cheryl Aguilar began her career upon successful completion of her studies in business at the Berkeley Business School in White Plains, NY. Her first position was as a receptionist for an English confection importer. After only 2 years on the job, she was promoted to the position of customer service representative where she enjoyed interacting with customers and assisting whenever needed. Ms. Aguilar held the title of lead customer service representative for the department for the next 10 years. After 10 years of service, she was promoted to the position of logistics coordinator where she continued to increase her skill set on many different aspects of business. She remained with the company for a total of 15 years at which point she took a “break” to raise her family. Ms. Aguilar gradually returned to the work force as a customer service representative for the world’s leading cutlery manufacturer. After a few years, she was promoted to executive assistant for both the CEO and the president and remained in that position for five years. Ms. Aguilar joined our program in January 2012 as our administrative assistant and was promoted to office coordinator in June 2017 and to training program administrator in April 2018.


Felicita (Fay) Sutton Administrative Assistant

Ms. Fay Sutton joined our team in 2019 following a 17 year career at International Business Machines (IBM) where she worked for 15 years as an administrative assistant and event specialist, executing events throughout the United States and Europe and managing complex scheduling and travel logistics for top executives. Directly prior to joining Phelps Family Medicine Residency Program, Ms. Sutton was a business operations manager for the IBM Watson Customer Engagement Team where she managed large-scale operations budgets and fulfilled all of the company’s internal software license requests. Prior to her career with IBM, Ms. Sutton held various administrative roles within the Ossining Community where she has been a life-long resident. A proud mother/grandmother, Ms. Sutton is dedicated to supporting her community and maintains a leadership role with the Ossining Upper Elementary PTA and is an enthusiastic Girl Scout troop leader.

Samantha Cardoso, MPA Project Coordinator

Samantha received her undergraduate degree at CUNY City College in 2012 and later received a Master of Public Administration CUNY Baruch College in 2018. Her graduate school capstone project focused on the necessity for maternity care providers in rural counties of Georgia in order to improve adverse maternal health outcomes, such as maternal mortality and morbidity.  Prior to pursuing education in public administration, Samantha worked in the non-profit sector managing grant-funded projects and delivering educational programs for organizations, including the March of Dimes and Girl Scouts. For the residency program, Samantha coordinates a variety of different projects, including our 5-year HRSA grant, focused on training future primary care leaders, marketing/recruitment initiatives, CME activities, and scholarly and community activities for our residents.