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Staff List


David Thayer, M.D.

David O. Thayer, M.D. specializes in women’s health care and has been practicing in Boulder since 1985.  He was the senior partner of Boulder Obstetrics and Gynecology, P.C. for many years, and together with several physicians and a talented group of Certified Nurse Midwives, delivered several thousand healthy babies to both private and uninsured patients of the Front Range region.  The practice was well recognized as unsurpassed in providing compassionate birthing of moms and babies, but also intelligent and respectful care and service for women.  Both then and now clients come from many counties in Colorado, a multitude of U.S. States, and several countries and continents to seek his advice and gentle manner. 

In December, 2000 David "retired" from the 24/7 excitement and stress of delivering babies and supervising midwives to focus his attention on the non-pregnant women of his practice.  Upon the urging of colleages and staff, The Thayer Group for Women's Care, P.C. was created to emphasize the shift in priorities.  He had already been developing his skills as a "minimally invasive " surgeon and now worked to advance the options available to his Colorado and extended clientele.  He is enthusiastic when he describes the transformation to the Thayer Group.  "The best and brightest women's health care practioners have joined me to create this unique practice that is totally focused on every aspect of women's health.  They are constantly challenging me to stay at the cutting edge of knowledge."

David still describes himself as " a surgeon that tries to help his patients avoid surgery."  But for those patients that need surgery, the minimally invasive techniques reduce the risks and speed the recovery.  It is now unusual for any of his patients to need the more "primitive" old style surgeries.  Even hysterectomies are routinely done as "band aid" type surgeries (another name for minimally invasive techniques) and are usually done as outpatients - meaning no overnight stay is necessary.  In 2007, several of his patients became the first in Boulder County to have the tremendous advantage of the "da Vinci Robot" to assist their surgery.  (See Links to learn more)

His clients quickly recognize he has a different approach to providing medical care.  David has a passion for helping people.  He spends the time to know his clients and tries to truely understand their needs.  He says he feels blessed when he discusses his career.  "Helping people maximize their health potential is unbelievabely rewarding.  I enjoy the interactions with my clients so much it doesnt seem like work,"  He has frequently been the guest speaker at events in Boulder County, speaking on a variety of topics involving women's health.  One of his favorites is updating audiences on Menopause and Hormonal treatments, including bioidentical therapy.

David was raised in Erie, Pennsylvania and practiced in Cortland, New York until his move to Boulder in 1985.  His medical education, internship, and residency were completed in Philadelphia, Pennsylvania and Hartford, Connecticut.

David is Board Certified in Obstetrics and Gynecology.  He is a Fellow of the American College of Obstetrics and Gynecology, a member of the Colorado Medical Society and the Boulder County Medical Society, and the Colorado Gynecologic and Obstetric Society.  He has operating priveleges at Boulder Community and Foothills Hospitals, the Longmont Surgery Center, and the Medical Center of the Rockies in Loveland.

David has two grown children.  He loves the active life style that Colorado provides and participates in a variety of challenging outdoor activities and sports.  He has captained the "C.C. Riders" team in the Courage Classic biking event, raising money for Children's Hospital in Denver for several years.  He also enjoys movies, reading and wood working.

David says:
“I am very committed to providing the best health care available.  I realize that my personal philosophy of health care sometimes runs counter to what insurance companies are willing to provide.  I want to educate women as to what the best and safest options are, so they can knowingly make well informed decisions.  I do not work for insurance companies.  My commitment is to my client.”


Karen Kaufman, M.D.

Dr. Kaufman, MD joins The Thayer Group in January 2011. She graduated from Case Western Reserve Medical School in Cleveland, Ohio and in 2001, completed her residency in Obstetrics and Gynecology at Northwestern University in Chicago, Illinois. Dr. Kaufman is looking forward to her re-entry into the Boulder medical community after working for Boulder’s Women’s Care when she first arrived in Boulder in 2001. Although Dr. Kaufman enjoys working with a wide variety of patients, she has a passion for adolescent medicine, fertility issues and menopause.


Tamara Lester, B.S.N., W.H.C.N.P.

Tamara is committed to helping women make healthy choices in managing their own wellness and strives to make a personal connection to her patients by addressing their unique needs in a therapeutic healing environment. She believes it is important to look at the “big picture” of a women’s life in the context of a holistic approach and spends time to get to know the real you. She loves to help educate and takes a team approach with them in making their own choices about their care.

Tamara has been a member of the Boulder Medical Community for more than 35 years. She is a Women’s Health Care Nurse Practitioner and is recognized as an Advanced Practice Nurse. She started her career working in the Maternity Department at Boulder Community Hospital in 1974 and then moved to the Emergency Department in 1980 and returned to her true passion of Women’s Health in 1990.

She is dedicated to women of all ages and takes great pride in the fact that she has been a part in the lives of many generations of women. She has a special interest in Peri-menopause and Menopausal concerns along with providing expertise in Bio-Identical Hormone therapies.

In her spare time she attends educational conferences and classes to expand and extend her knowledge of health care issues and evolving new treatments and procedures. She also volunteers for the local Health Fairs. She loves spending time with her extended family and friends and her cat named “Kittin”!



Teri Smith, Office Manager

I’m Teri the office manager at the Thayer Group for Women’s Care. I oversee the operation of the office on a daily basis. I’ve had twenty five years of experience working within the healthcare setting.

I am a mother and grandmother and when I am not at work I try to spend as much time as I can outdoors in our beautiful state, camping and fishing.

It is a joy to be working among such a caring and competent staff. As a staff, we really do strive to give you the best healthcare available. Many of our clients have been with the practice for more than twenty years. To me when a client stays with a practice that long, it shows how much she trusts and depends on us to help her with their healthcare needs. It is quite common for the Thayer Group to provide care for different generations within the same family. It is a great compliment to us when a client entrusts her daughter and/or her mother to us for healthcare.

We thank all those clients we have cared for through the years. We welcome new and former clients to the practice.

The Thayer Group hopes you will see why we are such a special women’s healthcare facility.




Liz Collard, Medical Assistant

I have been a medical assistant in Boulder for several years. I joined the medical field so that I could use my skills to help people. I have worked for Internal Medicine, Family Practice and now Women's Health. I enjoy my job working with The Thayer Group for Women's Care, as the providers here are extremely kind, compassionate and understanding.

I am the mother of 2 teenage girls, and when I am not working I enjoy spending time with them as well as being a positive influence in the neighborhood.


Tina Molina, Medical Assistant

I am a mother of 3 and a grandmother of 3. My husband is from Honduras, and I am very fluent in Spanish. I began my medical career in 1991 as a CNA. In 2000, I decided to go back to school to get my degree. I graduated in 2002 at the top of my class and received my Associates Degree in Medical Assisting. I have worked in a variety of offices such as Family Practice, OB/GYN, Pediatrics, Internal Medicine and Teen clinics. I love what I do and have a firm belief that every patient has equal priority and importance. It is my goal to help every patient as a part of her healthcare team. I take your health and concerns very serious and will do my best to get you the best possible care. I hold myself to a high standard and promise to give you my all, to the best of my ability. I look forward to being a part of your healthcare team and meeting your needs.


Maria Viguerias, Medical Assistant

My name is Maria, and I have been working here at the Thayer Group since November 2012. I graduated from PIMA Medical Institute in June 2010 and began my career as a medical assistant in a busy family practice. Although I enjoyed working in a family practice, I have to say that being at The Thayer Group has been the most fulfilling employment I've had due to the quality of specialty patient care that is provided. I feel fortunate to be a part of a team who all work together with our patients' health as our top priority. When I'm not at work, I enjoy spending time with my three wonderful children and fiance, doing fun and creative family activities. I also attend college, taking online courses to earn my associates in business management, so I can explore the possibility of opening my own salon in the future.


Wendy Stark, Medical Assistant

My name is Wendy, and I have been with the Thayer Group since June 2012. I graduated from Front Range Community College with an Associate Degree in Medical Assisting and a Certificate in Medical Administration. I enjoy working at the Thayer Group where complete and quality women’s care is our focus.

I am married with three children. In my spare time I teach water fitness for the City of Longmont.


Mikayla Bischoff, Medical Receptionist

My name is Mikayla, and I am a receptionist with The Thayer Group for Womens Care. I have an associate's degree in Business Administration and a bachelor's degree in Healthcare Management. I have been working in the health care field since 2006 and have been with The Thayer Group since 2008. Although, I have worked in other areas of the healthcare field; I can say that our staff is genuine, and we do our best to make your visit with us comfortable and informative.

I have several different job responsibilities that keep me busy, which I enjoy. I am the lead Receptionist and my duties include scheduling patient appointments, answer phones, dealing with patient related issues. I schedule surgeries for Dr Thayer, whether they are done at Boulder Community Hospital or In Office. Dr Thayer does Hysteroscopies, and Endometrial Ablations that help with abnormal bleeding. I also fill in as a medical assistant and assist the providers when needed.

Outside of work I enjoy the outdoors, taking my dog Cookie for walks. I am involved in my church choir, enjoy spending time with friends and family, and spoiling my nephews.


Libby Spatz, Billing Specialist

Libby is in charge of billing and insurance claims. She is the person to go to with office billing and health insurance questions and/or concerns. She welcomes you to call her at 303-465-1303. Her goal is to make the billing aspect of your visit with us as easy as possible.

She has a degree in Health Care Management and has had previous experience working in insurance companies as well as in OB-Gyn medical practices.

She is the mother of five and grandmother of two.

Libby enjoys working at the Thayer Group because as she says, “It’s a place where everyone truly cares for the individual client”.

Libby is simply the BEST in her field! The Thayer Group is delighted that we have a billing/insurance coordinator who is not only skilled and knowledgeable but kind and caring.



Consulting Staff

Lois Willhour, Certified Ultrasound Technician

Lois brings specialized skill and experience to the Thayer Group for Women’s Care. She performs ultrasound exams in our office. She has been working in the specialty of obstetrics and gynecology, including infertility care, since 1986. Lois has been with the Thayer Group since 1993.

Not only is Lois an excellent ultrasound technician, she has other talents too. Lois is a skilled artist. She creates beautiful handmade quilts.

The Thayer Group appreciates Lois and all the experience and skills she brings with her.



Kate Harding, R.N.C., N.P.

Kate Harding is a Registered Nurse, and Nurse Practitioner. She is also a Certified Biofeedback Therapist. She has been working in the field of women’s health care since the mid-seventies. She is originally from Chicago and has lived in Boulder for more than twenty-five years.

Kate received her basic nursing education in Chicago and her nurse practitioner education at the University of Colorado School of Nursing in Denver. She has worked with Dr Thayer, on and off, since he started his practice in 1985.

Kate is passionate about teaching. It is her goal to be a true advocate for the health and wellbeing of her clients. She actively listens and is committed to providing skilled individualized health care with respect, kindness and acceptance.

Kate says being a grandma is the best! She loves to laugh, spend time with friends and family, garden, read, and play with her dog, Lindberg.


Sat Tara Kaur Khalsa, MS, LPC

Sat Tara offers psychotherapy at the Thayer Group for Women. She received her B.A. from Smith College and her Master of Science Degree in Marriage, Family and Child Counseling in 1974. Since that time, she has been in the mental health field in a variety of settings. In 2002, she developed her model of Integrated Women’s Sexuality, a model that honors the physical, emotional, relational and spiritual complexity of a woman’s sexual response. She is particularly delighted to offer a gentle but powerful form of Neuro-Emotional Processing called “Brainspotting”. She has taught Kundalini Yoga and Meditation since 1972, combining it with psychotherapy to create Personalized Wellness Programs. To learn more about her work you can visit: or click HERE for more information.

Sat Tara has received extensive training in Mediation, Neuro-Linguistic Programming, Eriksonian Hypnotherapy, Brainspotting, E.M.D.R. and various other modalities. She is the author of numerous CDs, articles and a book entitled Divorce Survival and Recovery. For seven years of her career she worked as a social worker handling hundreds of cases of child abuse and sexual abuse. In private practice, she has assessed hundreds of cases regarding custody and divorce issues. She is a former faculty member of the Institute for Advanced Dispute Resolution. For more about her divorce work, you can visit

To learn more about Brainspotting, click HERE. To learn more about patients' experience with Brainspotting, click HERE.

Sat Tara has been actively involved in community service through a group she founded five years ago called the Women’s Global Forum, a consortium of over 100 organizations and individuals doing international work. She has also worked extensively in Collaborative Law and community mediation. She is the past president of Women Caring for Women.

Sat Tara is married to her wonderful husband and has two awesome grown children. She lives and works in Boulder, Colorado. She particularly enjoys the outdoors and photography. Sat Tara has been a Sikh since 1972. She speaks several languages and has an interest in other cultures.


Erin Livers, ICNT

Erin Livers, ICNT (Integrative Clinical Nutrition Therapist) is a multi-faceted nutrition therapist and health educator. Her integrative approach to nutrition therapy combines Nutritional Anthropology, Functional Medicine, Chinese Medicine, Guided Imagery, and Intuitive Counseling. While the foundation of her counseling is diet, she also incorporates nutrition supplements, herbal medicine and cooking instruction. She has dedicated her career to helping people discover how to nourish their body with food and nurture themselves in all aspects of life. Her philosophy is food as medicine: how our diet creates the foundation of our physical, mental, emotional and spiritual health.

In sessions, individuals, couples or families present their health goals and Erin takes a history to gain a comprehensive understanding of each person. This allows her to create customized recommendations to achieve long-lasting benefits. She helps people to lose weight and maintain it, improve digestion, relieve fatigue, sleep soundly, improve memory and concentration, balance mood and hormones, improve skin blemished by acne and eczema, improve PMS, relieve headaches, and more. Her clients feel better about their relationship to food and eating. They also learn how to save time when shopping and how to prepare healthy meals with renewed inspiration.

As a certified LEAP practitioner, she specializes in helping clients with chronic conditions related to food sensitivities, allergies and intolerances such as Ulcerative Colitis, Crohn’s disease, Celiac disease, GERD, IBS and other digestive issues, Interstitial Cystitis, migraines, chronic fatigue, fibromyalgia, ADD/ADHD, eczema, sinusitis, ear infections and others.

She currently teaches nutrition and health-related subjects at Bauman College, a school for holistic nutrition and culinary arts in Boulder. She also provides education to the public through her many classes, workshops and seminars. She is committed to teaching others as well as continuing her own education in holistic health. Erin resides in Boulder, where she tends vegetables, herbs, fruits and flowers in her organic garden before cooking and eating them.

Find out more at