Meet Our Veterinary Team
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
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
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
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
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
Lauren Hai, DVM
Dr. Lauren Hai, a native of the north suburbs of Chicago, joined GreenTree in May 2019. She obtained her undergraduate degree at Iowa State University and completed her veterinary degree at the University of Sydney in Sydney, Australia in 2014. She has worked in both emergency and general practice over the past years. She loves being a small animal veterinarian and has a passion for behavior, preventative and emergency medicine. She lives in Green Oaks with her husband Josh, their daughter Winry and their two dogs, Xena and Byron. She has many hobbies including playing video games, traveling, boating, crafting, and gardening.
Education: University of Sydney
Courtney-Amber Naas, Practice Manager
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.
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