Helena OB/GYN Associates

Choosing an OB/GYN provider is a very personal choice.


Our Board-Certified Obstetricians and Gynecologists, Dr. Jack W. McMahon and Dr. Alexis O’Leary believe that every woman deserves a choice for her obstetrical and gynecological care. Dr. McMahon has been a trusted provider in the Helena area since 1990, and we welcomed Dr. O’Leary to our practice in 2018. Dr. McMahon and O’Leary consistently provide exceptional, attentive obstetrics and gynecological care in a supportive, compassionate environment. Our providers, in collaboration with other physicians in the Helena community strive to provide our patients with the best care available.


In addition, our practice is unique because we offer choices in providers, as well as compassionate care. Our Nurse Midwife, Sue Ditchey-Hellems, and Family Nurse Practitioner, Denise Smigaj understand the personal needs, concerns, and preferences of women, from adolescents to menopause and beyond. All of our providers facilitate a supportive environment that fosters genuine listening, open communication, patient comfort, education, and the best obstetrical and gynecological care available. We believe in educating our patients to make informed decisions about their health and present a full spectrum of choices, including but not limited to:


annual well-women examsinfertility treatmentsnatural childbirth and birthing optionscare for High-risk pregnancy | family planning choices – Mirena IUDS – Depoprovera – Nexplanonmenstral problemspelvic painendometriosisSTD screeningmenopause managementhysterectomy | bladder repair


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  • What makes us different?

    Jack W. McMahon, MD & Helena OB/GYN Associates, P.C., and Alexis O'Leary D.O., share a unique professional relationship that blends the expertise of two separate medical practices with the convenience of one location and a shared, familiar, and friendly staff. Together, we specialize in obstetrics and gynecology, which includes the examination, diagnosis, prevention and treatment of women's health problems.

  • Putting the provide in Providers

    Drs. McMahon and O'Leary have completed specialty training after medical school and take courses regularly to keep up with the latest advances in women's care. Susan Ditchey-Hellems MSN, is a Certified Nurse Mid-Wife. Denise Smigaj FNP and Lynne Bryant CNP are Certified Nurse Practitioners and provide quality health care services to women of all ages. As leaders in women's healthcare, we are committed to providing superior obstetrical and gynecological care for the many stages of a women's life encouraging prevention, education and options.

  • Intangibles make a difference

    In addition to standard specialty care in obstetrics and gynecology, we offer evaluation and management of infertility, treatment of incontinence, menopausal management, hormone replacement therapy, endoscopic and laser surgery, medically or surgically complicated obstetrics, mammography, and ultrasonography.

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FACOG – It stands for “Fellow, American College of Obstetricians and Gynecologists.” ACOG is the nation’s leading group of professionals providing health care for women. The American College of Obstetricians and Gynecologists:

Serves as a strong advocate for quality health care for women

Maintains the highest standards of clinical practice

Provides continuing education of its members

Promotes patient education

Increases awareness among its members and the public of the changing issues facing women's health care