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Meet Our Staff


Our physicians are Board Certified in both Family Medicine and in Integrative and Holistic medicine and are trained in Functional Medicine. Dr. Calihan is a Certified Functional Medicine Practitioner. Our nurse practitioner is also trained in functional medicine, and we have a variety of other providers who offer services in alignment with our philosophy of health and wellness. That philosophy is that optimal health and wellness comes from being in balance in the body, mind, and spirit and that this is best attained through addressing each of the five key areas that contribute to the overall balance: healthful eating, balanced movement, integrative medicine, mindful stress management and interconnected living. These areas are the “stones” in the Five Stones.


Martha Calihan, MD 

Board Certified in Integrative & Holistic Medicine as well as Family Medicine, Certified Functional Medicine physician Dr. Calihan brings decades of experience to her work with patients, whom she helps achieve optimal health and wellness through a variety of techniques.

Dr. Calihan has spent many years studying and obtaining credentials in holistic, functional, and integrative medicine. Her practice has been awarded the Best of Loudoun prize for alternative medicine each year since 2007.

Dr. Calihan graduated from Smith College in Northampton, Massachusetts, before obtaining her medical degree from Georgetown University Medical School in Georgetown, Washington, DC.

Dr. Calihan trained and precepted at the Center for Mind-Body Medicine in Washington, DC, and she also trained in acupuncture with Dr. Joseph Helms at the David Geffen School of Medicine at UCLA.


In 2000, Dr. Calihan earned her board-certification in Holistic Medicine, and in 2014 became a member of the first class of Certified Functional Medicine Physicians through the Institute of Functional Medicine.


Dr. Calihan was a founding owner and former medical director at Loudoun Medical Group, one of the largest multi-specialty physician practices in the mid-Atlantic region. She was also their Board Chair from 2000 to 2005.


Dr. Calihan specializes in the treatment of chronic, complex conditions, including autoimmune disease, thyroid and hormonal imbalances, biotoxin illness, chronic fatigue, and fibromyalgia. Using the Functional medicine approach, she searches for the cause of a condition and then works to help rebalance the system. 


Bringing an element of Spirituality to her work, Dr Calihan weaves the science with the Sacred and blends the medicine with the mysticism. She has a special interest in end of life care, and is the author of A Death Lived, in which she describes her husband’s final illness and death as told through her dual vantage points of physician and wife.


Dr Calihan teaches meditation and offers workshops both in the US and Ireland.


Visit Dr. Calihan for compassionate, comprehensive health care with a personal touch. She’s currently welcoming new patients.


Irina Nikitina, ANP

Irina Nikitina completed her Adult Nurse Practitioner degree in 2007 through the George Washington University and George Mason collaborative program. She received additional advanced training while working with leading Lyme and Chronic Fatigue Syndrome experts resulting in over two decades of extensive experience in the treatment of various chronic disorders including tick borne infections, Fibromyalgia, Chronic Fatigue and Digestive Imbalances. Irina has developed a holistic, systems approach to providing compassionate, individualized care to even the most complicated of her patients.


Lara Lattman, MS, CNS, LDN

Lara is a Certified Nutrition Specialist and Licensed Dietition-Nutritionist. Working from the ground up, Lara focuses on helping her clients achieve a well balanced, nourishing way of eating. She uses food as medicine, and when necessary adds in professional grade supplements tailored to each individual’s needs. Lara also guides her clients toward a more balanced way of living, incorporating movement and rest, which along with good nutrition are the building blocks of a healthy lifestyle.

Lara graduated in 2014 from Maryland University of Integrative Health with her Master’s of Nutrition and Integrative Health and has been working in the clinical setting ever since. She is a Licensed Dietitian-Nutritionist by the state of Maryland. Before finding her path in wellness, Lara graduated from University of Massachusetts with a BA in Classics.


Michelle McGregor, DPT

Michelle offers 15 years of clinical experience as a Doctor of Physical Therapy with expertise in movement related disorders.  She utilizes the principles pf the Select Functional Movement Assessment (SFMA) which focuses on the function of the entire musculoskeletal system when addressing more specific symptoms areas.  Michelle is also certified in dry needling.


Amy Bridenstine, LPN

Amy is our LPN. Originally from Wisconsin, she moved to Virginia with her husband in 2011. She has been working in healthcare since 1996, starting as a certified nursing assistant in a skilled nursing facility. She enjoyed it so much, she decided to further her education at Milwaukee Area Technical College to become a Licensed Practical Nurse. Previously she has worked in family practice and skilled nursing facility. In her spare time, she loves to spend time with her family, and read.


Angie Rexrode

Angie is originally from England and came to the US as a child.  She brings a life long passion for health and wellness to the front desk.  Previously a personal trainer and pilates instructor, she has also worked at 2 physical therapy clinics as both a technician and a front desk receptionist.  Some of her favorite things are watching her son play lacrosse for Rutgers University, hiking with her daughter and dogs, practicing yoga and reading.


Louise Six

Louise provides IFMC with a unique set of concierge skills; whether following-up with patient call-backs, front desk needs and behind-the-scenes support, she brings a great warmth to all she touches. With a compassionate prior career in nursing, Louise has a great perspective in providing care and comfort. She has previously worked at a boarding school, in an orthopedics office and another holistic medical office. Louise embraces the holistic lifestyle and strives to represent a healthy approach to life, mind and body. She brings an earnestness to the office that is refreshing and makes us all rethink perspective and attitudes and see things fresh.


Vanessa Lindgren, CHT

A Certified Hypnotist since 1994, Vanessa brings years of experience, skill, and wisdom in helping and guiding her clients reach their goals. She actually started hypnotizing friends at school at the age of fourteen. Fast forward forty seven years, and she’s still at it!


Trained in Neuro Linguistic Programming (NLP), Ericksonian metaphoric and many other techniques. Vanessa keeps up to date with any new studies on the subject of modern hypnosis. She writes articles and creates new techniques of her own on a regular basis. She prides herself on being a perpetual student in the field of hypnosis, hypnotherapy  and hypnotism knowing learning never ends.


Vanessa is routinely referred by and works alongside many medical doctors, psychiatrists, psychologists and dentists and is a firm believer in collaborating with any and all professionals if she feels it will help her clients. She is at 35 year resident of Northern Virginia helping hundreds of people every year to reach their goals and overcome emotional blocks.  She is very passionate about helping people manage and overcome their anxiety.

Due to the pandemic, she is currently operating 100% online.   See More information here


Ann Thomas, MA, E-RYT 500

Ann has been teaching yoga and meditation at the Center since it’s inception in 2008. She offers group classes and one-on-one sessions in mindful stress management, yoga, meditation, and Reiki to support patients in their healing process and restore balance in mind, body, and spirit.


Her teaching experience extends over 25 years. She is certified in the Iyengar method of yoga instruction which is a classic hatha yoga style. It emphasizes awareness of movement, alignment, breath, and therapeutic techniques. She has studied several times at the Iyengar Institute in India, and has additional training in Integrative Yoga Therapy, and Relax & Renew® restorative yoga. She is also a Reiki Level III practitioner.


Ann has a master’s degree in Community Health Promotion and Education and has focused her work on the benefits of yoga and meditation to address stress-related illness since 1992. She was a biofeedback and yoga therapist, and health educator at Georgetown University Medical Center. She then earned a graduate certificate in theology, served as a hospital chaplain and is supportive of the role faith can play in healthcare. She is honored to be part of the Five Stones Center, and to walk with others on the journey toward wholeness in mind, body, and spirit, through every stage of life.


Christoper Voysey

Christopher designs and implements individualized functional exercise programs.

He has been a Personal Trainer for 12 years including six in management roles. His love of fitness began at age 14. A skinny kid all his life, he wanted to find a way to add muscle so he could join the wrestling team, which led to weight lifting. Almost immediately, strength training turned from a hobby to a passion that would eventually become a career. Christopher attended Elon University where he earned a Bachelor of Science Degree in Exercise Physiology, and is certified by the National Strength and Conditioning Association and National Academy of Sports Medicine.


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