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Our Providers

Karen Niver, M.D.  F.A.C.O.G.

As the founding partner of Northpointe Ob/Gyn, Dr. Niver has been practicing obstetrics and gynecology in the Blue Water Area for over 25 years. She completed her residency at William Beaumont Hospital system and is board certified by the American College of Obstetrics and Gynecology. Dr. Niver specializes in obstetrics and is an accomplished and sought after vaginal surgeon. An active member of the community, she is currently on the board of trustees for St. Clair Community College. 

Jon Lensmeyer, M.D.  F.A.C.O.G.

Dr. Lensmeyer is board certified by the American College of Obstetrics and Gynecology and has been practicing in Port Huron for over 17 years. He completed his residency at University of Wisconsin-Milwaukee. Dr Lensmeyer specializes in obstetrics and gynecologic surgery, including minimally invasive surgery using the DaVinci Robot. He is married and is the father of 3 daughters and one large bulldog. 

Amanda Hurtubise, M.D.  F.A.C.O.G

Dr. Hurtubise is a native of Michigan and has been practicing Ob/Gyn in Port Huron since 2006. She is board certified by The American College of Obstetrics and Gynecology having completed her residency at the University of Wisconsin. Dr. Hurtubise has enjoyed a busy obstetrical practice and now is focussing on the holistic approach to gynecology with attention to hormonal balance and wellness. She is currently serving on the Board of Directors of McLaren Port Huron Hospital. Dr. Hurtubise is married and has 3 teenagers.

Stacey Tremp, DO, F.A.C.O.O.G

Dr. Stacey Tremp joined Northpointe Ob/Gyn in July, 2017 and is a native of Port Huron. She received her medical degree from the New York College of Osteopathic Medicine and her undergraduate degree from Michigan State University. Dr. Tremp enjoys being a part of women's lives and has a special interest in performing robotic-assisted, minimally invasive surgeries, urogynecology and obstetrics. Involved in training future physicians, Dr. Tremp is an Assistant Clinical Instructor at Michigan State University's College of Osteopathic Medicine. Married with two sons and a daughter, Dr. Tremp enjoys the outdoors, skiing, and spending time with her family.

Melissa Mathurin, W.H.N.P

As a women's health nurse practitioner with over 20 years of experience in obstetrics and gynecology, Melissa Mathurin joined Northpointe Ob/Gyn in 2014. She has a special interest in bioidentical hormone replacement and obstetrics in addition to well woman care. Along with Dr. Hurtubise, she is a certified BioTE® provider. Melissa served in the United States Navy and is a skilled equestrian. 

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