Meet our team

When it comes to caring for your family our team of doctors provide the highest level of care.

Every team has their MVP--or most valuable player. We like to think of ourselves as your most valuable pediatricians, get it--MVP! Scroll down and meet the team that's going to take your family care to the next level!

Allison Gati M.D.


Allison Gati M.D. was born and raised on the Upper West Side of Manhattan. After attending University of Michigan undergrad (Go Blue!) and New York Medical College for medical school, she completed her pediatric residency at Columbia Presbyterian. Dr. Gati began her pediatric practice in 2006 back in her old stomping grounds of the Upper West Side. She always wanted to be a Pediatrician and is so happy to play a special role in children’s lives from birth to college. When not in the office, she can be found with her husband and 3 children in River Run playground or eating ice cream at Emack and Bolio’s. Her favorite children’s books are Doctor Desoto and Matilda.

Jessica Grant M.D.


Dr. Jessica Grant has been practicing pediatrics in New York City since 2006, after having completed medical school at Columbia College of Physicians and Surgeons and residency at Columbia University Morgan Stanley Children’s Hospital. After growing up in New Jersey and then living in Ithaca while attending Cornell, she was thrilled to discover life in the big apple and never plans to leave! Dr. Grant enjoys getting to know the families in her practice well and takes seriously the privilege of guiding her patients’ growth and health. She especially loves that because she practices in her neighborhood, she gets to see her patients in their natural habitat. She hopes her patients will come say hello to her, her husband and her two daughters when they see her at the park, bookstore or favorite local restaurants, though be prepared she may chat your ear off. Despite having read them no fewer than a hundred times each, her favorite children’s books currently are Pout Pout Fish and Room on the Broom.

Judith Hoffman M.D.


Judith Hoffman M.D. is originally from the midwest, but after 20 years in New York considers herself a true New Yorker. After successfully spending four years at the University of Michigan without attending a football game, Dr. Hoffman moved to New York to attend NYU for medical school. She completed her residency at Columbia Presbyterian with Drs Gati and Grant and immediately started working in private practice. Dr. Hoffman considers it a privilege to ride the waves of parenthood with the families she works with; she loves getting to know both the parents and children, providing sensitive, non-judgmental advice. Dr. Hoffman lives in Harlem with her husband, 6 year old daughter and beloved schnauzer Gus. She has been known to travel to the outer boroughs for the best dim sum in the city, sometimes via bike. Her all time favorite children’s book is “Harriet the Spy.”

Lisa Nowell M.D.


Lisa Nowell grew up in upstate New York and spent her summers in the Adirondacks. After attending college at Hobart and William Smith she completed medical school at Duke University. She did her residency here in New York at Columbia Presbyterian and has been practicing primary care in New York ever since. From the beginning of her medical education she has always been certain pediatrics would be her career. She loves being allowed to participate in the growth of a child and family throughout the different developmental ages. When not in the office she can be found on the upper west side with her husband and daughter. She also enjoys swimming and cooking. One of her favorite childrens’ books is The Big Orange Splot.

Prantik Saha M.D.


Prantik Saha MD MPH is Canadian by birth, South Asian by blood, nomadic during his youth, and has called NYC his home for more than 20 years. After graduating from Case Western Reserve University medical school, finishing residency training at Johns Hopkins Hospital, and spending his first two years in practice in rural Ohio, he came to NYC in 1998 and spent 13 years as full time faculty in the Department of Pediatrics at Columbia University Medical Center, balancing residency teaching, an urban primary care practice, and obtaining a Master’s degree in Public Health, as well as a short stint as a DJ in the early 2000’s. Dr. Saha joined the practice in 2011 and continues his teaching endeavors at Columbia University and beyond while seeing patients at MVP. He lives in the upper west side with his wife and 10 year old daughter, and his all time favorite children’s book is “The Story of Ferdinand”.

Jessica Walthall N.P.

Nurse Practitioner

Jessica Walthall grew up in Maryland and has spent her adult years moving up and down the east coast. She attended Duke University where she learned to love Carolina BBQ and sleeping in a tent for basketball tickets. After graduating with a degree in Biology, she moved back to the northeast and after working for a few years as a preschool teacher and in developmental research, she completed the Pediatric Nurse Practitioner program at Yale University School of Nursing. Jessica is passionate about working with children and families to promote health and wellness and takes pride in helping children and teens feel comfortable, safe, and listened to. Jessica lives with her husband and her english ivy plant, “Ivan.” Her favorite children’s book is “Messy Jessie.”

Melina Baez

Front Desk Manager

Melina Baez was born in the Dominican Republic. As many of you know, she has been with MVP for 11 years now and she wouldn’t change it for anything. Her favorite part of working at MVP is having the ability to watch the MVP children grow, and of course giving out stickers!!! Her favorite childhood book is A Bad Case of Stripes by David Shannon

Kassandra Ferrer

Medical Assistant

Kassandra is a new Medical Assistant here at MVP. She has a drive and passion for the medical field. Being a medical assistant helps her feel that she is helping someone. Her favorite childhood book is “Venezuela en Libertad “.

Gersan Knights

Sr. Medical Assistant

Gersan Knights, you may know her as Gee, is a senior medical assistant here at MVP. She has lots of enthusiasm and a love for helping kids. Gee feels that being a part of the MVP team gives her a sense of community where we treat and respect each other and the patients like family. Her favorite childhood book is Anansi the Spider Man by Phi.

Yvette Montoyo

Sr. Medical Assistant

Yvette Montoyo is a senior medical assistant here at Manhattan Valley Pediatrics. She is the mother of one and has been in the medical field for over 4 years. She dedicates herself to instilling a positive health experience in children and is honored to be part of a team that embraces community and dedicates itself to serving others everyday. Her favorite children’s book is “The Rainbow Fish.”

Katrina Davila

Medical Assistant Manager

Katrina Davila is the Medical Assistant Manager for MVP. Katrina has been a part of the MVP team for over 12 years. Katrina lives in Queens with her husband and 4 children: Mariana (14yr), Gabriel (7yr), Nathaniel (4yr), Lilliana (2yr), and a puppy named Mylo. Katrina chose to work in a pediatric office because she loves to see the growth and progression that babies experience as they grow into their own individual selfs. Katrina provides assistance to the doctors with vital signs, screening, and blood draws. She also ensures that the back-office operates smoothly.

Kieosha Davis


Kieosha Davis was born and raised in the Bronx, and graduated with a Masters Degree in healthcare management. Kieosha appreciates how MVP devotes its work towards serving patients during this pandemic. Kieosha has one daughter who is 16 months old. During her time off, she enjoys spending time with her family and friends. Her favorite book is “Red riding hood and the big bad wolf”.

Nora Fleischmann

Practice Administrator

Nora was raised in Europe, absolved her Baccalaureate in Germany and studied Business Administration in London. After a stance in another industry, Nora pivoted into her Mom’s footsteps–pediatrics; Nora has 15 years of leadership experience managing different specialties with an emphasis on creating patient-centric environments. Her strong guiding principle is that healthcare is a basic human right for everyone and thus should be accessible to all. Nora lives in Harlem with her son and her dog. She and her son often volunteer for the “Habitat for Humanity” and “Best Buddies”, a program designed to empower people with intellectual and developmental disabilities. “I am thrilled to have joined Manhattan Valley Pediatrics”, she says “this has been a homecoming for me, I grew up in a pediatric practice and being here feels great!” Nora’s favorite children’s book is “The Giving Tree” by Shel Silverstein, “it sums up everything”, she says.

Romie Then

Jr. Medical Assistant

This is Romie, she’s one of our junior medical assistants here at MVP. Romie has been with us for almost 2 years now. She has a 5yr old daughter and because of her child, Romie has fallen in love with learning and exploring pediatrics. She enjoys watching your children grow and transition from their first few days of life, into their fun and creative toddler years. Her favorite part of working MVP is being part of a supportive team that even through challenging times, they enjoy being surrounded by one another. Romie’s favorite book is : The very hungry caterpillar by Eric Carle.

Aida Abreu


Aida is one of the newest members of our team, she joined MVP in 2020 and is originally from Puerto Rico. Aida loves welcoming patients to our practice and enjoys helping parents navigate the complex visit schedule our children need. She has a 12 year old daughter who she devotes every spare minute to and loves spending time with. Aida is also going to school for medical billing, likes to try new things and wants to grow.

Erika Pons

Certified Medical Assistant

I am a Certified Medical Assistant with 12 years of experience in the medical field. Making others feel comfortable within the healthcare industry is my strength and also my motivation within this field. I was born and raised in Manhattan, Washington Heights. My parents are from the Dominican Republic. I have two wonderful children, Eric is 13 and Kayla is 9. We love doing fun activities as a family, especially spending the day at Sloomoo Institute where we get to play with slime. We love to keep our traditions, such as my favorite kids book Goodnight Moon by Margarete Wise Brown.

Sean Wickham

Medical Assistant

Sean Wickham grew up in a small town outside of Charlotte, North Carolina. He attended college at Emory University where he majored in psychology and pre-medical studies. He played basketball for his entire life, including two years in college. In his free time you can find him exercising, watching sports, eating, and playing with his labradoodle, Winston. As someone who is new to this city and the practice, he is excited for the challenges and lessons that lie ahead! His favorite children’s book is The Night I Followed the Dog.

Tanasja Nixon

Certified Medical Assistant
My name is Tanasja Nixon. I was born in Queens but raised in Harlem NY. I love spending quality time with my family and friends. I have nephew who is like my son that I love very dearly. My family is what keeps me going. I’ve always had a passion for working in the medical field. I chose to work at a pediatrics office to gain more knowledge in the field and also because children are so full of life and it’s always great to see how fast they grow over time. My favorite childhood book is Dr. Seuss green eggs and ham.

Jamie Wells

Jamie Wells is a registered nurse who is originally from Southern California. She has a Masters in Science in Nursing from Columbia University and is currently attaining her Doctorate in Nursing Practice from Columbia University to become a Pediatric Nurse Practitioner. Jamie lives in the Upper West Side with her partner John and cat Lion. Her favorite part of working at MVP is getting to know the patients and their families, and loves to make her patients laugh. Her favorite children’s book is Clifford, the Big Red Dog.

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