269.781.1183 | 269.781.9248 (fax)

269.789.9298 (After hours emergency)


269.719.8046 | 269.719.8049 (fax)

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About Us


Mark Walker, MD

Mark Walker, MDDr. Walker was born in Detroit. He received his undergraduate degree from the University of Michigan and his Medical Degree from the Wayne State University School of Medicine. After completing his OB/GYN residency at the Detroit Medical Center, he and his wife, Dr. Lori Zettell, traveled for a year. They then moved to Marshall in 1995 and started Mansion Street OB/GYN. Dr. Zettell retired in 2002 to stay home to raise their 2 children, who are now grown and living in Ann Arbor. Dr. Bartlett joined the practice in 2002. Dr. Walker specializes in vaginal surgery. Outside of work he enjoys spending time with his family, church activities and going on mission trips to South Africa.

Dr. Walker’s nurse is Erika, L.P.N. at 269.781.1183, ext 3
Click here for office hours and location schedule for Dr. Walker and Erika


Neysa Bartlett, DO

Neysa Bartlett, DODr. Bartlett received her undergraduate degree from University of Michigan-Dearborn with a major in biology and minor in psychology and her Osteopathic Medicine degree from Michigan State College of Osteopathic Medicine. She completed her Ob/Gyn residency at Botsford Hospital in Farmington Hills, MI. She remained on staff at Botsford as a physician and resident trainer. During that period of time she became board certified in obstetrics and gynecology. She also maintains her certification as a clinical assistant professor in the department of Osteopathic surgical specialties at Michigan State. Seeking a location that allowed her to expand her medical abilities she relocated with her three children and husband to Marshall, MI in 2002. Dr. Bartlett joined Dr. Walker in maintaining and building Mansion Street Women’s Health into a premier practice dealing with a variety of women’s issues. Dr. Bartlett takes care of a wide range of obstetrical and gynecologic problems as well as preventative medicine. Dr. Bartlett has also completed extra training in medical weight loss and continues to stay current in this area. She has been running a weight loss program since 2008, which is now named Mansion Street Medical Weight Loss. Most recently, Dr Bartlett obtained her board certification from the American Board of Obesity Medicine in March 2016. She personally consults with and advises numerous female and male patients on various methods of weight reduction and maintenance.

Dr. Bartlett’s nurse is Ally, R.M.A. at 269.781.1183, ext 5
Click here for office hours and location schedule for Dr. Bartlett and Ally


Karissa Hawley, CNM

Karissa Hawley, CNMKarissa Hawley, CNM is the practice’s new midwife. A native of Kalamazoo and a current resident of Battle Creek, Hawley has been a nurse for six years, the last three of which have been in the emergency department at Oaklawn. This past May she completed her master’s degree in Nurse Midwifery at the University of Michigan from which she received the Bonnie Kaye Mallory-Foremand award for clinical excellence. Hawley began seeing patients in August 2015 at both the Marshall and Battle Creek locations.

Karissa’s nurse is Teri, R.M.A. at 269.781.1183, ext 7
Click here for office hours and location schedule for Karissa and Teri


Ashley Espejo, CNM

Ashley Espejo, CNMInformation coming soon!






Kirsten Schaefer

Kirsten Schaefer Michigan native Kirsten Schaefer has been a part of the Mansion Street Obstetrics & Gynecology / Mansion Street Women's Health family since September 2010. Kirsten has a background in both the hospitality industry and the medical field. She obtained a degree in Business Management and is the office manager for both the Marshall and Battle Creek locations. Kirsten is also a volunteer with the American Cancer Society Relay for Life and the American Heart Association. If you have any questions, comments or concerns, she may be contacted at msogofficemanager@jasnetworks.net or 269.781.1183 ext 9.


Have a question for
Mansion Street Women's Health?

To contact our office via email, please use the links below. If you have your MSWH patient account #, please include it in your email. Do not include sensitive patient information such as date of birth or social security number unless using the secure messaging feature of our patient portal and contacting the provider directly.

Medical Records, referrals and the receptionist department
Billing & Coding Specialist, Shawna
Billing & Patient accounts, Kris
Office Manager, Kirsten

Contact our billing department at 269.781.1183, ext 8

American College of OB/GYN
American College of Osteopathic Obstetricians and Gynecologists
Michigan State Medical Society
Christian Medical and Dental Association




Services Provided

  • Preventative healthcare including pap smears & breast examinations

  • Obstetrical Care

  • Family Planning

  • OB/GYN Ultrasonography

  • Colposcopy

  • LEEP

  • Cryotherapy

  • Edometrial Ablations

  • Pelvic Floor Reconstruction

  • DEXA Bone Density Testing

  • HALO® Breast Pap Test

  • Urodynamics/PST Testing

  • Mansion Street Medical Weight Loss