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. Wes Bonnell 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 has a strong background in healthcare, with diverse experiences that highlight his dedication to patient well-being and sports-related expertise.

  His journey in healthcare began with a student clerkship at the VA Connecticut Healthcare System in CT, where he provided high-quality, evidence-based care to veterans dealing with acute and chronic pain conditions. This experience laid the foundation for his commitment to improving patients' lives.

  Dr. Parrilla then joined a skilled multidisciplinary pain management team in St. Louis, Missouri, where he collaborated with medical doctors, nurse practitioners and physical therapists. Together, they focused on reducing opioid prescriptions and delivering non-operative treatments for patients struggling with chronic pain and musculoskeletal conditions.

  Currently, Dr. Parrilla provides high quality care to patients Khalsa Chiropractic in Cambridge as well as providing onsite care for numerous athletes, athletic teams at Harvard University and the Boston Red Sox. There, he utilized a range of soft-tissue and manipulative techniques to address sports injuries and soft-tissue conditions.

  Dr. Parrilla's dedication to patient well-being, coupled with his expertise in musculoskeletal healthcare and sports-related injuries, reflects his commitment to delivering compassionate, evidence-based care. His philosophy emphasizes education, pain reduction, and improved functionality.

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  Dr. Wes Bonnell completed his undergraduate studies in Exercise Science with a Strength and Conditioning minor at the University of Delaware. After completing his degree, Wes spent the next 8 years as a Sports Performance specialist, working with professional, college, high school, and elite level youth athletes around the country, including 4 years working directly under Kevin Neeld (Director of Performance, Boston Bruins) at a high performance ice hockey facility in Pitman, New Jersey.

  Wes continued his education obtaining a Masters degree in Human Biomechanics and Rehabilitation from the University of Concordia, Chicago, leading into his role as an Exercise Physiologist at a physical therapy facility in Philadelphia. The facility serves the Eagles, Sixers, the Philadelphia Orchestra, the Philadelphia Ballet, and surrounding college athletes. Wes was appointed Director of Continuing Education which allowed him to collaborate with some of the top health professionals in Philadelphia.

  Following his passion for prevention and earlier intervention, Wes pursued his Doctorate from the Los Angeles College of Chiropractic. While attending, he specialized in sports medicine, performing clinical rotations with the LA Rams and Los Angeles SWAT.

  Prior to coming to Boston, Wes served as a sports chiropractor at a golf specific performance gym in Santa Monica, CA. His patient base included a wide range of skill level from PGA tour players to beginners. Utilizing hands-on body work and detailed biomechanical analysis, Wes treated a host of rotation specific injuries.

  Dr. Bonnell is passionate in bringing a modern, evidence-based approach to healthcare: blending science with real world application and experience. Wes believes that quality movement and exercise are the underlying keys to real, long-lasting health. He prioritizes specific, individualized protocols, instilling confidence, and making it a true collaboration between patient and doctor.

  In his free time, Wes enjoys playing pick up ice hockey, cooking, and camping.

  Certifications

  • Certified Strength and Conditioning Coach (NSCA)
  • Selective Functional Movement Assessment (SFMA)
  • USA Weightlifting Performance Coach (USAW)
  • BioForce Certified Conditioning Coach (8WeeksOut)
  • Postural Restoration Institute (PRI)
  • Corrective Exercise Specialist (NASM)

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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.