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Dr. Charles Gehrman

Dr. Charles graduated from the University of MN College of Veterinary Medicine.  His special interests, aside from preventive care and wellness, include gastroenterology and endoscopy.  Dr. Charles inherited his passion for veterinary medicine from his father, Dr. Fred, and has enjoyed carrying on the tradition of quality, state-of-the-art veterinary care for his community.  He, his wife and 2 sons have lived in the Minnetonka/Plymouth area his entire life.  His personal hobbies include playing saxaphone in a local band, hanging out with his mules (really!) and enjoying his grandchildren.


University of Minnesota, College of Veterinary Medicine

Areas of special interest:

  • Preventive Care
  • Gastroenterology
  • Endoscopy

Dr. Andrea Johnston

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 welcomed a daughter, Avery, in April, 2013 and another daughter, Quinn, in March 2016.  Her family also includes her Laborador, Sullivan. Her interests include running, reading, spending time with family and cross country skiing.


University of Minnesota, College of Veterinary Medicine

Areas of special interest:

  • Preventive and wellness care
  • Internal medicine
  • Emergency medicine
  • Dentistry

Dr. Rob Memmen

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.  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.  In his spare time, Dr. Rob enjoys playing basketball, playing guitar and volunteering with organizations such as Big Brothers and Big Sisters.  


University of Minnesota, College of Veterinary Medicine

Areas of special interest:

  • Dentistry
  • Surgery
  • Dermatology
  • Internal Medicine
  • Preventive care 

Dr. Liz Aldridge

Dr. Liz graduated from the Universty of Minnesota College of Veterinary Medicine and worked in Des Moines, Iowa before joining the team at Gehrman Animal Hospital in 2016.  She grew up in Sun Prairie, Wisconsin and graduated with honors from Iowa State University for her undergraduate degree.  She enjoys working with clients to provide high quality veterinary care to their pets and believes regular wellness care is important for pets to live long and healthy lives.  In her free time, Liz enjoys camping, hiking, photography and spending time at her family's cabin in northern Wisconsin. Dr. Liz's family includes her husband, Aaron, Bernese Mountain Dog, Kaia, and cat, Kika.


University of Minnesota College of Veterinary Medicine

Areas of Special Interest:

  • Preventative and wellness care 
  • Dentistry 
  • Reproduction


Mandy Haider, CVT, Practice Manager

Mandy pursued a degree in Veterinary Technology because she loved the variety that comes with the job. She grew up in Minnetonka and has been with Gehrman Animal Hospital since her clinical internship in 2003.  In 2015, Mandy took on the role of Practice Manager for GAH. She keeps our business running smoothly and our clients happy. Mandy and her husband, Chad, are parents to a daughter, Teagan. Their house is also co-owned by a beast of a black lab named Bo. 


Hopkins High School

Argosy University - AAS in Veterinary Technology

Joined the Gehrman Team in 2003

Suzy Gullett, CVT

Suzy is our "lab guru".  She keeps all of our equipment and processes in the lab/pharmacy area running smoothly.  No surprise - she considers lab work the best thing about being a CVT, as well as being able to help people help their pets.  She pursued a career in veterinary medicine because of her love of animals and finds the best thing about GAH is the staff she works with.  Suzy grew up in Plymouth, which is where she makes her home with her husband, 3 children, a dog and a cat.  She keeps very busy attending her kids sporting activities, baking and keeping things clean and organized.


Medical Institute of MN (now Argosy) - AAS Veterinary Technology & Concordia College

Certified Veterinary Technician

Joined the Gehrman Team in 2009

Jim Melstrom, CVT

Jim has been a familiar face at Gehrman Animal Hospital for many years.  He is our Senior CVT and provides mentoring and coaching to all of our tech team.  Jim says the best thing about being a technician is providing health care to companion pets.  He grew up in Stillwater.  Outside of work, his hobbies include fishing, hiking, biking, trapping, entertaining and coaching.  Bubba, Jim's devoted Bichon Frise, frequently accompanies him to work!


Bemidji State Univ & University of MN 

US Army

Certified Veterinary Technician

Joined the Gehrman Team in 1972

Heather Storey, CVT

Heather joined the GAH crew in August 2015. After spending several years working in physical therapy for our four-legged friends in Ohio, Heather and her husband, John, moved to Minnesota to be closer to family in La Crosse, Wisconsin. She loves being able to be more hands-on with her patients in day practice and enjoys getting to work more closely with her peers. Heather and Jon have FIVE dogs; Molly, George, Lucy, Norma and Walter.  In her free time, Heather enjoys going to rock concerts, road trips, art museums and reading a wide variety of genres. Oh, and she's a HUGE Packers fan.... We'll let it slide.  


BS in Psychology 2005  University of Wisconsin- La Crosse

AAS in Veterinary Technology 2010 Globe University

Joined GAH August 2015

Susanne Smith, Vet Tech Assistant

Susanne had a different career path but when she volunteered and later worked at the Humane Society, she knew she wanted a career working with animals.  She was a client at GAH and jumped at the opportunity to join the team.  Susanne finds it is great being able to help sick animals and their owners and the best things about Gehrman Animal Hospital are the great doctors and very caring staff.  Susanne grew up in Milroy, MN and is a busy mom of 2 children plus 2 dogs.  Her hobbies revolve mostly around her kids activities but does take time for reading,  watching TV, and baking treats for the GAH staff.


North Dakota State Univ - BS in Natural Resource Management

Currently enrolled in AAHA Veterinary Assistant Certification program

Joined the Gehrman Team in 2011

Katie Engnell, CSR/Vet Tech Assistant

Katie joined the team in January of 2016. She was initially hired as a Client Service Representative but was quickly cross-trained to work as a Veterinary Assistant as well. Her love of working in Veterinary Medicine is evident by the smile on her face while she assists the doctors with our patients. Katie and her fiance, Kyle, live in Bethel, MN and have an English Pointer named Quincy and a French Bulldog named Goga. Her hobbies include, hunting, fishing, camping and gardening. 


BS in Equine Science 2014 Rochester Community and Technical College

Joined the GAH team January 2016

Sarah Whitesel, CSR

Sarah joined the GAH team in November of 2015 as one of our Client Service Representatives. Her extensive background in client service and love for animals has made her an irreplaceable member of our team. It doesn't hurt that she is a chef as well!  Sarah grew up in the Twin Cities and has a daughter named Trinity. They share their home with a rambunctious pup by the name of Finn. In her spare time you will find Sarah outdoors, cooking, traveling and engaging in services within the community. 


Earned her Culinary Certificate in 2011

Joined the GAH team Nov. 2015

Nina Warmboe, CSR

Nina was a member of our GAH staff for 10 years before deciding to try joining her husband in retirement. After 4 years, she missed her co-workers, GAH clients and their pets so much that she had to return! We are so happy to have her on our team again and sharing in the journey of people and their beloved pets. Nina feels fortunate to have her three grown children (and one daughter-in-law) all living nearby in the metro area. In addition to time with family and cuddling with her dog, Tika and grand-dog, Lily Bee, her enthusiasms include long-distance bicycling, theater, road trips, and a gourmet dinner group. 


Joined the GAH team in 2002

Blobcat, (Purrsident)

Bobcat was a stray at the Wright County Humane Society with a bad tail injury when Dr. Bob decided to adopt him.  The injury necessitated amputating his tail, thus leaving a "bob" tail and that is how he got his name.  Bobcat went home to live with Dr. Bob around 2005 and enjoyed his home life there until the spring of 2013.  Changes in Dr. Bob's household created stressors for Bobcat and he started urinating inappropriately in the house.  Part of his therapy regimen was coming to Gehrman Animal Hospital for behavior modification.  He ingratiated himself to the staff and clients and GAH is now his permanent home!  


No formal education.  Believes education and training are beneath him!

Weight challenged - has empathy for others who struggle with this disorder.

An all around good guy!  Joined the Gehrman Team in 2013.