Meet Our Veterinary Team

Veterinarians in Libertyville: Dr. Brown

Laura Brown, DVM

Dr. Brown graduated from the University of Illinois College of Veterinary Medicine in 1987 after receiving her undergraduate degree in Biology at Illinois. Dr. Brown began her veterinary career in Southern California, where she was primarily involved in equine medicine for thoroughbred racehorses. She transitioned her focus to small animal medicine in 1989 when she joined Mission Animal Hospital in Oceanside, California. She remained at Mission until 1992 when her husband’s job transferred them to southeast Idaho.  While practicing in Twin Falls and Pocatello, Dr. Brown and her husband Kris took advantage of the beautiful scenery and skied when not taking emergency calls. Dr. Brown joined DuPage Animal Hospital in Villa Park, IL in 1993 (another husband job transfer), where she practiced small animal medicine and surgery. In August of 1996, Dr. Brown opened GreenTree Animal Hospital in Libertyville, and the rest is history. Thanks to the support of her husband Kris and their daughters Sara and Clare, finding work-life balance has been enjoyable. Sara (ILL-INI) and Clare (Go Gamecocks) have recently made Kris and Laura empty nesters. For Dr. Brown, keeping busy with Stanley the Golden Retriever, Brownie the geriatric cat, and getting together with friends have become the new normal.

Veterinarian / Owner

Education: U of I College of Veterinary Medicine

Veterinarian in Libertyville: Dr. Estrick

Sara Estrick, DVM

Dr. Sara Estrick graduated from Iowa State University College of Veterinary Medicine in May 2000. She is an Iowa native and received her undergraduate degree at Cornell College in Mt. Vernon, Iowa. Dr. Estrick practiced for one year at a small animal hospital in Kenosha, WI before coming to GreenTree in 2001. General medicine, behavior, and geriatric medicine are special areas of interest for Dr. Estrick. She lives in Grayslake, IL with her husband Neil, their sons Jack and Henry, their dogs Annie, Chip, and Tug, and their cats, Banjo and Waffles.


Education: ISU College of Veterinary Medicine

Veterinarians in Libertyville: Dr. Ianakov

Deni Ianakov, DVM

Dr. Deni Ianakov received her bachelor degrees in Animal Science and Veterinary Medicine at the University of Illinois. In May 2004, she obtained a Doctorate in Veterinary Medicine from the University of Illinois College of Veterinary Medicine. As a new graduate, Dr. Ianakov was excited to join the GreenTree Animal Hospital team in July 2004, where she is building on her strong interest in orthopedics and pet dentistry. Dr. Ianakov resides in Highland Park, Illinois with her husband Luis, daughter Giselle, son Sebastian, and rat terrier, Ziggy.


Education: University of Illinois

Veterinarian in Libertyville: Dr. Hardy

Laura Hardy, DVM

Dr. Laura Hardy received her Doctorate of Veterinary Medicine from Iowa State in 1986. She then completed a year-long internship at the Veterinary College of Kansas State University. Dr. Hardy has interests in soft tissue surgery, pet dentistry, and general medicine. Born in Cleveland, Ohio, Dr. Hardy has also lived in New York, Virginia, Iowa, Oregon, and California before moving to Illinois in 1990. Along with her husband Mark, Dr. Hardy shares her home with their dogs Penny and Tucker, their cats Ace and Redford, and a menagerie of fish, amphibians, snakes, and sometimes her adult children, Sam and Sarah.


Education: ISU College of Veterinary Medicine

Veterinarians in Libertyville: Dr. McKenzie

Susan McKenzie, DVM

Dr. McKenzie has been an associate veterinarian at GreenTree since March 2012. She is a 1992 graduate of Michigan State University’s College of Veterinary Medicine and has previously practiced in St Louis, Missouri and Albuquerque, New Mexico. She lives with her husband Jeremy and their two children, Ben and Jillian. Dr. McKenzie currently has no four-legged pets as Jillian is allergic to dogs and cats. Hopefully, she will outgrow this soon as both children really would like to have a dog or cat of their own.


Education: Michigan State University

Veterinarian in Libertyville: Dr. Morton

Erica Morton, DVM

Dr. Erica Morton graduated from the University of Illinois, College of Veterinary Medicine in May 2016, and is very excited to start her new career at GreenTree. She graduated from Northern Illinois University with a Bachelor of Science in 2009. She lives with her fiancé in Gurnee, and they are excitedly anticipating and planning their wedding, which is set for September 2017. Dr. Morton has a keen interest in exotics and companion animal medicine, ultrasound, and orthopedics. She will be seeing our exotics and pocket pet patients here at GreenTree. She has a ball python, Cuda and 5 crested geckos at home, Smeagol, Icterus, Zora, Drakonas, and Hermes. She is hoping to adopt a small dog in the near future. Her favorite activities include archery, karaoke, video games and movies, and reading mystery, fantasy, and romance novels in her spare time. Erica is enthusiastic about continuing to expand her knowledgebase, and is looking forward to building lasting relationships with our clients and of course the pets!


Education: U of I College of Veterinary Medicine

Worked as a veterinary technician for 3 years prior to medical school

Courtney Amber Naas- head shot

Courtney-Amber Naas, CVT

From an early age, Courtney would tell her parents she was going to be a veterinarian. At 15, she started her first job as a kennel attendant for a veterinary hospital in one of Chicago's northern suburbs. This role taught her about proper care for the patients and the facility. She worked her way up to a technician assistant and eventually an unlicensed technician. Along the way, she realized she didn't want to be a veterinarian but instead, a technician. In this role, she truly felt she was an advocate and caregiver to her patients. Courtney earned her certification as a veterinary technologist in 2010.

After taking time off to raise her son, Courtney returned to general practice working in veterinary management. As a manager, her hope is to inspire, mentor and train veterinary support staff to ensure clients and their pets receive the best possible care. Her professional goal is to specialize as a Certified Veterinary Practice Manager. In her free time, Courtney enjoys gardening, photography, swimming and spending time with her son, their dog, and their two cats.

Certified Veterinary Technician

She spent 12 years working in specialty medicine including emergency and critical care, specialty surgery, and internal medicine.

Veterinarians in Libertyville: Dr. Reilly

Cathy Reilly

Cathy joined the GreenTree team in 2002 as the Front Office Manager. Cathy created and runs the puppy socialization classes offered at GreenTree, and is a talented dog and cat trainer. She lives with her husband Pat, dogs Dixie, Maybel, MiG, and Maverick, and cats Clover and Ethel.

Front Office Manager

Enjoys Flyball and Nosework with her dogs

Special Interests: Behavior & Training

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