12800 Wayzata Blvd

Minnetonka, MN 55305

Our Veterinary Team

Andrea Johnston, Owner and DVM

Dr. Andrea is a graduate of the University of MN College of Veterinary Medicine. Dr. Andrea also completed a rigorous one year post doctorate internship in Small Animal Medicine at the U of M. Her special interests include internal medicine, emergency medicine and dentistry. She enjoys working with clients to help them understand how preventive care can set their pet up for success and optimal life expectancy. Dr. Andrea and her husband both grew up in the Minnetonka area and are both graduates of Hopkins High School. Dr. Andrea and her husband have three daughters, Avery, Quinn, and Shea. Her interests include running, reading, spending time with family and pets, and cross country skiing.

Rob Memmen, Owner and DVM

Dr. Rob spent most of his childhood in Savage, MN and graduated from Burnsville High School. He completed his undergraduate training at the University of Wisconsin Madison and graduated from the University of Minnesota College of Veterinary Medicine. Dr. Rob worked in a small animal practice in South Bend, IN, following graduation and joined the GAH team as an Associate Veterinarian in 2013. Dr. Rob and Dr. Andrea became co-owners of GAH in 2017. His professional interests include dentistry, surgery, dermatology and internal medicine. Dr. Rob is passionate about preventive care and wellness care for pets and helping pets enjoy long, healthy lives. Dr. Rob and his wife live in Minnetonka with their children Elizabeth and James, dog Annie, and keep their horse Emma in Independence. Dr. Rob enjoys volunteering with organizations such as Safe Hands Animal Rescue and Big Brothers and Big Sisters. He also sits on the board of the Minnesota Veterinary Medical Association.

Ian Veitch, Associate DVM

Dr. Ian graduated from Kenyon College with a Bachelor's degree in Biology. He went on to graduate from the University of Minnesota College of Veterinary Medicine and then completed a rotating small animal surgery and medicine internship at VCA Alameda East in Denver, Colorado. Dr. Ian is a Minnesotan through and through and was happy to return to his hometown of Minneapolis after his internship. Dr. Ian has spent the past year at a non-profit veterinary clinic which has been very rewarding and fulfilling. He is thrilled to be part of the staff at Gehrman Animal Hospital and looks forward to building meaningful relationships with clients and their beloved pets. Dr. Ian holds a special interest in internal medicine/metabolic diseases and emergency medicine, though he truly enjoys all aspects of general practice. In his spare time, he enjoys recreational sports, from tennis to ice curling. He is also an avid foodie and enjoys trying new foods and restaurants. He and his girlfriend have two loving and goofy pets, a pit bull named Toast and a cat named Nayah.

Jenn Wilder, Associate DVM

Dr. Jenn grew up in Hopkins, and earned her undergraduate degree from the College of Saint Benedict. After obtaining her DVM from the University of Minnesota College of Veterinary Medicine, she completed an intensive year-long internship at Blue Pearl Veterinary Partners. Before joining Gehrman Animal Hospital, she worked at a busy clinic in the north suburbs as well as a full-service house call practice based in Minneapolis. Her special interests include dentistry, dermatology, and internal medicine. When not in the office, you can find Dr. Jenn spoiling her enthusiastic Pit Bull (Bean), exploring the North Shore or discovering new restaurants with friends.

Jena Rogers, Associate DVM

Dr. Jena grew up in Willmar, MN and obtained a Bachelor’s degree in Microbiology from North Dakota State University. She graduated from the University of Minnesota College of Veterinary Medicine and worked as a veterinarian in the South Metro area prior to joining Gehrman Animal Hospital in September 2019. Dr. Jena has special interests in dentistry, dermatology, and behavior, although she loves the variety that comes with general practice. She is passionate about the human-animal bond, and has an appreciation for building relationships with pet owners and their furry family members. Jena shares her home with her wonderful husband, an energetic and silly husky mix (Cliff), and an opinionated medium-haired cat (The Müf, short for Mufasa). When she’s not at work, Jena enjoys a variety of outdoor activities, including running, hiking, kayaking, paddleboarding, cross-country skiing, and gardening.

Katie Cartledge, Associate DVM

Dr. Katie grew up in central Wisconsin. She completed her bachelor’s degree at the University of Wisconsin River Falls and graduated from the University of Minnesota College of Veterinary Medicine. Prior to joining Gehrman Animal Hospital in November of 2020, she worked at small animal practices in Roseville and Minneapolis. Dr. Katie’s professional interests include preventative care, internal medicine, general surgery, and client education. She really loves the variety that general practice offers. Dr. Katie also volunteers with The Street Dog Coalition as co-Team Lead Veterinarian, Red Lake Rosie’s Rescue to offer veterinary care during their wellness clinics and is on the board of directors for Pet Haven animal rescue. In her free time, Dr. Katie enjoys finding new restaurants, eating baked goods, imbibing good beer, rowing with Minneapolis Rowing Club, and tending to her flower garden. Katie and her wife, Colby, share their home with their two dogs, Goose and Marta, and their four opinionated cats Ed, Louise, Chad, and Marlow.

Stefan Knep, Associate DVM

Dr. Stefan grew up in Cologne, Germany. He studied in Berlin before moving to Minnesota in 1991. (His MN born wife played an important part in that decision).

He received his veterinary degree from the Minnesota College of Veterinary Medicine in 1993. Before joining Gehrman Animal Hospital he worked for small animal clinics in Long Lake and Roseville.

His main interests involve internal medicine, preventative care and client education. He is also one of two lead veterinarians for the MN chapter of ‘The Street Dog Coalition’, a volunteer organization that provides free veterinary care for the pets of individuals who experience homelessness.  Dr. Stefan and his wife Heidi, live in South Minneapolis, have three red headed children, 2 dogs and grudgingly provide shelter for one of their son’s approximately 80 tarantulas. In his free time he loves riding motorcycles and enjoys soccer, reading, bicycling and brewery produced liquids. He can also provide your pets with a bilingual education.

Timothy Mayerhofer, Associate DVM

Dr. Mayerhofer is a graduate of Saint John’s University with a bachelor’s degree in biology. He graduated veterinary school at the University of Minnesota College of Veterinary Medicine. Following veterinary school, he was selected for a rotating internship in small animal medicine and surgery at the Veterinary Medical Center at the University of Minnesota. Dr. Mayerhofer went on to practice urgent care/emergency medicine in the greater twin cities area for several years. Following this, he practiced small animal general practice medicine for several years in Monterey, California before returning home to Minnesota and joining our team here at Gehrman Animal Hospital. He is happy to be back in Minnesota near family and friends. His professional interests include dentistry, small animal medicine, and preventive care to improve the quality of life of our pets. Outside of veterinary medicine, Dr. Mayerhofer enjoys spending time with his wife and son Charlie and exploring/traveling together. He also enjoys recreational hobbies of boating/fishing, scuba diving, and enjoys watching Formula One Racing and Minnesota Wild Hockey. Dr. Mayerhofer looks forward to connecting with the community in the surrounding area around their residence in Shorewood. 

Cameron Houk, Associate DVM

Dr. Cam is originally from Ohio and graduated from the University of Minnesota College of Veterinary Medicine in 2022.  He is passionate about the intersection of medicine, science, and education, and prior to veterinary school he spent several years teaching high school students in the sciences and mathematics.  Inspired by the day-to-day variety of being in the classroom, he chose to orient himself towards veterinary medicine to combine all the things he loved: deciphering the animal patient, leading in the community, teaching people of all ages, exploring the outdoors, contributing to quality medicine with client- and patient-centered care, and pursuing innovative scientific advances.  Dr. Cam has a passion for client education, surgery, preventative care, and internal medicine.  Dr. Cam enjoys time on the porch with a good read or some lively tunes with his fiancée, Katie, and pointer pup, Fitz.  You can find them on or around the lake no matter the season – kayaking, fishing, running, biking, dock-diving, hammocking with an icy cold brew (coffee or beer or both!), sailing, snowshoeing, skiing; you name it!!  Know a good book? – let Dr. Cam know!

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