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Our Advanced Practice Providers

Kristen Klein, NP

Kristen is a native Long Islander. She attended Adelphi University for her undergraduate, where she received a Bachelor of Science in Nursing in 2007. After graduating, she worked in the Surgical Intensive Care Unit at Stony Brook Medicine for eight years. She subsequently enrolled in the Stony Brook University Masters of Nursing program, graduating in 2015 with a certificate in Adult-Gerontology. Kristen continued to work for Stony Brook Medicine as a Nurse Practitioner for the division of Trauma Surgery. She left Stony Brook to join the Pain Institute of Long Island in 2018. 

Kristen has a passion for providing competent and compassionate care to help her patients. She enjoys the challenge of pain medicine, as well as the interactions and relationships she develops with her patients.

Stephanie Corrado, PA

Stephanie went to Dowling College on Long Island where she obtained her bachelor’s degree in Psychology. There she was a two-sport athlete, playing both soccer and lacrosse while remaining on the Dean’s list throughout her career. 

She then went on the Nova Southeastern in Jacksonville, Florida where she received her master’s to become a Physician Assistant. She has now been a Physician Assistant since 2014 with experience as a first assistant in spine surgery cases while working directly with pain management. She continued her career and expanded her knowledge as a well-rounded practitioner, gaining experience in performing Botox injections, and then trigger point injections for pain management. 

She continues to work diligently in continuing her education and expanding her knowledge and skills to help better treat her patients. She enjoys working individually with each patient and building trust and relationships to provide the best care possible. She enjoys hands-on procedures and injections and enjoys creating a treatment plan with her patients to provide them the relief they are hoping for. 

Rebecca Timoney, PA-C

Rebecca began her education at the University at Albany where she studied Psychology. She was consistently recognized on the Dean’s list of distinguished students and took part in multiple honor societies before graduating in 2011 with her bachelor’s degree. 

While applying to Physician Assistant programs, she used this time to work with Dr. Steven Pinsky treating chronic pain patients. 

She was accepted into the Physician Assistant Studies program at the New York Institute of Technology which began in September of 2013. 

Upon completing the program and being inducted into the Physician Assistant Honor Society in 2016, Rebecca was almost immediately hired back to continue working with chronic pain patients with Dr. Pinsky as a Physician Assistant. They both became part of the Pain Institute of Long Island in 2018.

Rebecca has used and continues to use the principles and knowledge that she learned during her time studying psychology at SUNY Albany combined with her medical knowledge from NYIT to not only diagnose and treat her patients but to relate to them on a deeper and more individualized level. She works with a team of medical professionals and also works autonomously to deliver the best possible care to her patients.

Rebecca diligently works to expand her knowledge and skills through continuing medical education programs to stay up to date on evidence-based medicine and new and evolving treatments for pain. 

Kelly Hafers, PA-C

Kelly graduated from the University of Michigan in 2018 with a Bachelor of Science (B.S.) degree, with a major in Movement Science and a minor in Biology. After graduation, she spent a year working as a medical scribe in the Emergency Department at St. Joseph Mercy Hospital in Ann Arbor, MI, and Good Samaritan Hospital in Suffern, NY.  

Kelly then went on to graduate in 2021 from the University of Bridgeport Physician Assistant Program in Bridgeport, CT.  She has now begun her PA career at the Pain Institute of Long Island and has been treating patients ever since. She currently resides in Manhattan.



Nina Araujo, PA-C

Nina joined Long Island Physician Associates in 2014, caring for patients in both the Interventional Pain Medicine and Surgical Divisions.  Prior to her career as a Physician Assistant, she previously earned a Bachelor of Science in Business from the State University of New York and a Master of Arts in Education from the University of Connecticut, enjoying a career in healthcare and medical communications. Nina then earned her clinical degree, a Master of Science in Physician Assistant Studies, from Touro College and joined the practice upon completion of her degree. She holds certifications including ACLS, and BLS, as well as certified in da Vinci Robotic Surgery System by Intuitive Surgical.

Nina has been a long-time member of the American Academy of Physician Assistants, the New York State Society of Physician Assistants, and an affiliate member of the American College Surgeons.

Karin Zaberto, NP

Karin is an AANP board certified Adult-Geriatric Nurse Practitioner at Pain Institute of Long Island. She originally attended Binghamton University, where she received a Bachelor’s degree in Psychology. Karin then went on to obtain a master’s in Psychology from Hunter College where she focused on neuroscience research. Realizing her passion for working directly with patients she pursued her interest in nursing, graduating with honors from Binghamton University and then later with an MSN from Adelphi University. Karin has worked as an RN in various settings including psychiatry, substance abuse, and orthopedics. Her time spent as an orthopedic nurse at Hospital for Special Surgery inspired her to pursue a career in pain management. 

Neenu Puthusseril, NP

Neenu is a board-certified adult/geriatric nurse practitioner at the Rockville Center-LIJ office. She specializes in adult pain management with a strong background in surgical nursing. While working as a registered nurse at Brookdale Hospital, she acquired valuable experience in an ICU step-down unit. She then pursued a career at Northwell-LIJ on a women’s surgical oncology floor working primarily with breast cancer patients. Her experience at Northwell not only refined her skills in adult pain management but it fostered a further interest in the field. After receiving her MSN from Adelphi University, she accepted a position as a nurse practitioner with the Pain Institute of Long Island. “It is truly rewarding to offer a tailored plan to various pain patients that will ultimately end their suffering and improve their quality of life.”

Stacey Hildebrand, NP

Stacey is a certified adult health nurse practitioner who provides comprehensive pain management. Stacey performs pain assessments, minimally invasive pain interventions, and medication management. 

Stacey obtained her master’s of nursing at Stony Brook University. She is certified by the American Association of Nurse Practitioners. Stacey is dedicated to providing compassionate care to all her patients in pain. 

Nurse Practitioner Ruth Bochat

Ruth Bochat, NP

Ruth is a board-certified Family Nurse Practitioner. She received her Bachelor’s Degree in Nursing at New York University. She enjoyed six fulfilling years at the bedside in various specialties including medical intensive care, subacute medical telemetry, and emergency medicine. She was honored with the Daisy Award For Extraordinary Nursing. She then obtained a Master of Science in Nursing from Downstate Medical Center and holds a national certification with the American Nurses Credentialing Center (ANCC) as a family nurse practitioner.

Ruth is a member of various professional organizations including the American Association of Critical-Care Nurses, American Nurses Association, and Sigma Theta Tau International Honor Society of Nursing, and was inducted into Psi Tau Chapter. She is fluent in both English and Spanish.

Nurse Practitioner Ruth Bochat

Keri Chaloupka, NP

Keri is an AANP board certified Adult-Geriatric Nurse Practitioner at Pain Institute of Long Island. She attend Quinnipiac University to obtain her Bachelor of Science in Nursing and later attended Stony Brook University for her Masters of Science in nursing. She previously worked for 10 years as an RN in a surgical unit where she cared for many patients in acute and chronic pain following surgery. She is happy that she can now help to manage her patient’s pain over a prolonged period of time.

Nurse Practitioner Ruth Bochat

Patricia Kirschen, L.AC.

Patricia has been practicing acupuncture for more than 30 years, combining medical acupuncture with traditional Chinese medical philosophy. She has interests in holistic and intuitive healing, and has studied herbal and homeopathic remedies as it relates to pain management. Having been born and raised in Mexico she incorporates Mayan healing knowledge into all her treatments.

Nurse Practitioner Ruth Bochat

Shayna Berretta, PA

Ms. Berretta was born and raised on Long Island. She graduated from Desales University in Pennsylvania in 2018 with a bachelor’s degree in medical studies and a Master of Science in Physician Assistant Studies, after completing an accelerated five-year program. After completing her degree, she moved back to Long Island and began working as a PA in a Neurology and Internal Medicine office until recently, when she joined Pain Institute of Long Island. Shayna enjoys working with patients and allowing them to be a part of their treatment plan. She continues to seek new ways to expand her knowledge to help treat her patients.