The doctors of Khalsa Chiropractic have a long-standing commitment to clinical excellence along with a deep passion to helping individuals achieve their health care goals.

The doctors' considerable experience in treating neuromusculoskeletal pain syndromes is enhanced by their previous positions in treating professional football players, traveling with NBA players, as well as providing care for Olympic rowers, tri-athletes, Ironman competitors, and collegiate athletes.

Our team of physicians remain steadfast in living a healthy lifestyle, be it through diet, running, yoga, biking, meditation, swimming, surfing, weight training, or simply walking, thereby bringing personal life and health experiences to their practice.

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  Dearest Patients,

  Forty-years ago I could have never imagined experiencing the happiness and fulfillment that I have in caring for you and your families in the greater Cambridge community. Doing so has brought me a joy I did not know could be found in one simple profession.

  At this time with Dr. Andrea Ansenberger, Dr. Kyle Parrilla as well as Dr. Kyle Lin at the helm of the office, I am able to (as of August 8, 2022) dedicate my professional services to caring for the New England Patriots. Contractually, I will be with the team for several years. With full confidence in our Cambridge Office staff, I can step away and pursue this athletic adventure.

  I thank you from the bottom of my heart for giving me such a fulfilling and meaningful career in serving you the past decades.

  With fondness,
  Hari Khalsa

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  Dr. Hagan is a graduate of New York Chiropractic College (NYCC) and brings to the practice a passion of working with athletes and active individuals. After graduation he pursued additional coursework in sports medicine obtaining his Certified Chiropractic Sports Physician certificate through NYCC. He has studied and received certifications in techniques such as Active Release, FAKTR, Structural Integration as well as many others. Dr. Hagan’ treatment style incorporates a number of soft tissue treatment techniques in addition to traditional chiropractic and exercise prescription. It is the integration of these techniques that shapes his unique approach and that of the Khalsa Chiropractic team. He currently serves as chiropractic consultant to Harvard University Sports Medicine, the Boston Red Sox and the New England Patriots.

  He is a native of Massachusetts and currently resides in Georgetown with his wife and two children. Outside of the practice, Dr. Hagan enjoys running, biking, skiing and just about anything outdoors.

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  Dr. Sara Morrissey Posner is founder and owner of Khalsa Chiropractic Back Bay. She is a licensed chiropractor in the state of Massachusetts.

  Dr. Sara obtained her B.A. with honors in Kinesiology at the University of Western Ontario, in Canada. Here, she had the privilege of serving on the Sports Medicine Team for Varsity Women’s Rugby. She then earned her Doctorate of Chiropractic at New York Chiropractic College, graduating with honors as a member of the Phi Chi Omega honor society. Dr. Sara was accepted into an honors residency program at South Shore Neurological Associates in Long Island, NY. This interdisciplinary practice specialized in a team approach to chronic pain management, which integrated neurology, physical therapy, chiropractic and acupuncture.

  Her post-doctoral studies include training in the fields of women’s health, nutrition, the chiropractic management of pregnancy, and functional soft tissue and rehabilitation. As a Chiropractic Physician, Dr. Sara has a passion for working with the athletic population. She served as the team chiropractor for the Boston Breakers in the National Women's Soccer League from 2012 to 2017. She has also served as a Chiropractor for varsity athletes from many local colleges and universities. She also works with elite level runners and triathletes providing care and training for their rehabilitation.

  She is Graston Technique® certified and uses Graston, as well as other myofascial release techniques to enhance soft tissue and joint mobility. Dr. Sara also enjoys working with the pregnant population. She is a member of The International Pediatric Association and is Webster Technique certified. This gentle technique effectively provides greater comfort for women during pregnancy, as well as creating an ideal in utero environment for the baby.

  Dr. Sara sees patients at our Boston office in a collaborative space with Johnston Family Acupuncture and The Pilates Lab. In her free time, she enjoys running, skiing, and spending time with her husband and three daughters. Dr. Sara is a native of Toronto, Canada.

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  Dr. Andrea Ansenberger attended Michigan State University where she obtained her B.S. in Kinesiology and Exercise Science. She graduated from National University of Health Sciences with her Doctor of Chiropractic degree.

  Dr. Ansenberger enjoys working with all groups of active individuals, from elite athletes to weekend warriors. She has focused her post-doctorate education in functional soft tissue and rehabilitation and utilizes a variety of techniques when treating patients. She is certified in Active Release Techniques, Instrument Assisted Soft Tissue Mobilization, and RockTape. She has also been trained in the McKenzie Method of Mechanical Diagnosis and Therapy. In addition to traditional chiropractic techniques, she uses a unique whole body approach when evaluating musculoskeletal conditions to ensure the treatment plan is tailored to each patient’s specific needs. Dr. Ansenberger’s specialty in soft tissue treatment allows her to proudly serve as the chiropractor to Harvard University Track and Field, a successful division 1 program.

  Dr. Ansenberger is a Chicago native, born and raised and is currently practicing in our Harvard Square location. In her free time, she enjoys exercising, trying new cuisines, and exploring Boston.

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  Dr. Andreea Toader is co-owner of Khalsa Chiropractic Back Bay. She received her Honors Bachelors of Science degree in Kinesiology from McMaster University in Hamilton, Ontario. She then spent two years working as a Kinesiologist in both a multi-disciplinary clinical setting and a Crossfit gym where she developed a passion for working with active individuals. She went on to pursue a chiropractic degree and graduated Summa Cum Laude from New York Chiropractic College. She spent the majority of her clinical tenure in an MD/DC chronic pain clinic where she managed individuals with unique and complex neurological conditions.

  Dr. Toader employs a variety of manual therapies such as FAKTR® and Graston® with the goal of restoring mobility and promoting proper joint biomechanics. She is Rocktape® and Webster technique certified and enjoys working with patients ranging from athletes and performers to expecting mothers.Patient empowerment is the ultimate goal of her care as she strives to educate her patients on taking on health initiatives which both supplement her treatments and provide sustained relief.

  Dr. Toader works at our Boston location in a collaborative space with Johnston Family Acupuncture and The Pilates Lab. She maintains an active lifestyle through running, yoga, weight training and salsa dancing.

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  Dr. Kyle Parrilla completed his undergraduate studies in Biology with a focus on physical and occupational therapy, at Assumption University in Worcester MA. After completing his degree, he went on to pursue his Doctorate in Chiropractic at the University of Bridgeport. During his time in school, Kyle completed a student clerkship at VA Connecticut Healthcare System in CT where he gained expertise in practicing within an integrative healthcare system providing high quality and evidence-based care to veterans with acute and chronic pain conditions. Dr. Parrilla also gained extensive experience treating student athletes in the university’s outpatient clinic.

  Shortly after graduation, Dr. Parrilla began his career in healthcare outside St. Louis, Missouri, treating patients as part of a skilled multidisciplinary pain management team including medical doctors, osteopaths naturopaths and physical therapists. The team focused on the reduction of opioid prescriptions and non-operative treatments for chronic pain and numerous musculoskeletal conditions. Most recently, Dr. Parrilla has spent time treating Division 1 athletes at Harvard University, addressing sports-related injuries and treating soft-tissue conditions. He has utilized multiple soft-tissue and manipulative techniques to treat both athlete and non-athlete patients alike.

  Dr. Parrilla’s passion for treating musculoskeletal conditions and identifying solutions for his patients’ pain with conservative care continues to grow daily. Dr. Parrilla believes in an integrated, evidence-based approach for his patients. While at work, Dr. Parrilla’s goal for treating his patients is to provide education while decreasing pain and improving function. While outside of the office, he enjoys watching New England sports and spending time trying new restaurants with his wife – suggestions are welcome!

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  Dr. Kyle Lin was born and raised in Taiwan until the age of 14 where he and his family moved to Long Island, New York. Dr. Lin attended Stony Brook University where he received his B.S. in health science with a concentration in environmental health. He then went onto attend University of Bridgeport School of Chiropractic where he received his Doctor of Chiropractic degree.

  Dr. Lin has completed additional certifications in Functional Taping for Musculoskeletal Injuries (FTMI), Functional and Kinetic Treatment with Rehab (FAKTR), Fascial Manipulation (FM) Stecco Method and Neurologic Dry needling or Pain Management and Sports Rehabilitation through Integrative Dry Needling (IDN).

  Most recently, Dr. Lin practiced in New Haven, CT. In a sports rehabilitation setting, he had the pleasure of treating collegiate athletes from Yale, Southern Connecticut State University (SCSU), and Quinnipiac University before relocating to Massachusetts with his wife Vivian and their dog Momo.

  Dr. Lin believes the best approach to most musculoskeletal sports related conditions is with a combination of chiropractic manipulation, soft tissue techniques, and exercise rehabilitation. He currently practices in our Cambridge location.

  In his free time, Dr. Lin enjoys all things outdoors including hiking, biking, and kayaking with his wife.

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  Dr. Jonathan Schaller is committed to bringing the highest level of care to his patients. He has spent many years working with people of all ages and abilities to improve their health and wellness. A graduate of New York Chiropractic College, Seneca Falls,NY, he is himself a lifelong chiropractic patient. He brings extensive clinical and research experience to each and every interaction at Khalsa Chiropractic.

  Dr. Schaller believes utilizing treatments customized for each person is central to helping patients lead healthy and active lives. He draws from an extensive “toolbox” of manual therapy techniques as well corrective exercises to create individualized treatment plans for each of his patients. He believes that with a little help and supportive care, everyone can get back to doing the things they love.

  He is a lifelong cyclist and runner who enjoys exploring the back roads and trails of New England. On a beautiful day, you may also find him walking through the Fells with his partner and their dog, Lucy.

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  Dr. Dennis J. Matos attended Concordia St. Paul, where he graduated with his Master’s degree in Sports and Exercise Science. He then attended Palmer College of Chiropractic West Campus, earning his doctorate in Chiropractic. Before coming to Massachusetts, Dr. Matos completed a two-year residency at North Western Health Sciences University in Minnesota. There, Dr. Matos worked at the Human Performance Center and provided care for athletes from over 12 different sports. These athletes ranged from high school to the professional level and included jiu-jitsu, women’s football, Olympic weightlifting, and hockey, to name a few. In the last year of his residency, Dr. Matos provided chiropractic care at Augsburg University for both the men’s and women’s sports teams. He also taught different classes ranging from extremity care to post-operative rehabilitation courses.

  Dr. Matos specializes in biomechanics and rehabilitation in sports but loves to treat anyone and everyone! Dr. Matos believes everyone is unique and different regardless of what injury they come in with, which is why he spends time getting to know the patient and what their goals are. Through education and the utilization of different chiropractic techniques, Dr. Matos empowers each patient to help them overcome their pain!

  Dr. Matos is a certified Functional and Kinetic Treatment with Rehab (FAKTR) provider, Functional Range Conditioning movement specialist (FRCms), USA Weightlifting Level 1 (USAW1) Coach and a Certified Chiropractic Sports Physician (CCSP).

  Dr. Matos practices at our Boston office.