Learning and education are very important here at Appelbaum Animal Clinic.

We strive to have a state-of-the-art hospital with a staff trained in the latest medical advances.

Our patients deserve the very best veterinary care.



Dr. Appelbaum

Mark Appelbaum


Dr. Appelbaum was born in Oklahoma City, and graduated from Del City High School in 1986. He attended Oklahoma State University, where he attained his bachelor’s degree in Agriculture in 1991 and his Doctor of Veterinary Medicine degree in 1995. His professional interests include internal medicine and soft tissue surgery. Dr. Appelbaum’s hobbies include sports, music, traveling, and spending time with his wife and 3 sons. His oldest son, Joseph, is a Finance/Accounting major at Oklahoma State University. His middle and youngest son, Ben and Max, attend Jenks Public Schools.


Leslie Appelbaum

Practice Manager

Leslie attended the University of Oklahoma, where she earned her bachelor’s degree in Public Administration, in 1993. She later earned a master’s degree in Education, from Oklahoma State University. After years of working in both the public and private sectors, she found the most joy while staying home with her two sons Ben and Max. Now that they are almost ready to fly the nest, she is enjoying working alongside her husband at Appelbaum Animal Clinic.



Brenna Brawner

Brenna Brawner


Dr. Brenna Kristine Brawner is a native of Edmond, Oklahoma. A devotion to animals was determined early in life as she was raised on a horse ranch. She was competitive in the Appaloosa and Paint horse all around show circuits achieving 15 world and national titles through her youth career. During high school she was highly involved in her FFA chapter by holding multiple officer positions and competing in CDE events, speech competitions and Equine Proficiency contests at the state and national level. She competed on the Division I equestrian team in the event of reining and received her bachelor’s degree in Biochemistry and Molecular Biology from Oklahoma State University graduating summa cum laude. Her Doctorate in Veterinary Medicine is also from Oklahoma State where she graduated first of her class. Brenna is an avid college football fan and enjoys tailgating for the Oklahoma State Cowboys and doing anything outdoors in her spare time; this includes riding ATVs and UTVs, shooting sports, hiking, riding horses and playing fetch with her Labrador retriever, Roger. Brenna’s veterinary interests focus on preventive care, client education, soft tissue surgery, diagnostic imaging and emphasizing making economical decisions on a case-by-case basis.


Meet our Staff

Lacey Loveless



Veterinary Nurse standing against the wall


Assistant Practice Manager/ Veterinary Nurse 

Peyton attended Oklahoma State University and received a Bachelor’s degree in Animal Science Biotechnology. She has worked in the veterinary field as a veterinary nurse for eight years. Peyton has two kitties, Feliz Navidad and Barbara, and two dogs, Steve and Nala. However, she considers herself a lover of all animals…from cats to cows.


Yayoi Usry Customer Relation Manager holding a dog


Customer Relations Manager

Yayoi began working in the veterinary field back in 2002. What started as a part-time job, soon became a career. She loves animals and enjoys the stories that the clients share. Yayoi attended Oklahoma State University and earned her Bachelor’s degree. She has worked with Dr. Appelbaum for close to 20 years. She enjoys team work and the family friendly atmosphere AAC has to offer. Yayoi has a daughter named Aleena and a Papillon named George. In her spare time, she is busy taking Aleena to her dance competitions, traveling, or attending many festivals in the Tulsa area.


Veterinary holding a newborn puppy


 Veterinary Nurse

Abby found her dream job when she became a nurse at Appelbaum Animal Clinic. Taking care of animals has always been her passion. In Abby’s free time, she loves spending time with her three year-old son, Philip. Abby is also a fur mom to three dogs and two cats.


Animal clinic staff holding a dog



Denise has worked in the veterinary medical field off and on since 2004. She loves meeting clients and their pets! She finds it rewarding to work in the veterinary field because it is ever changing and always offers something new to learn. She has an eleven-year-old son, Dylan, who is her pride and joy. She loves music and highly supports to local music scene here in Tulsa and surrounding areas. She also enjoys reading, binge watching awesome tv shows, being a cat (LOL), and anything to do with Donald Duck and sea turtles.


A female veterinary nurse with her dog


Veterinary Nurse

Lynnsey started working in the veterinary industry in 2007, and shortly thereafter, attained a Veterinary Assistant degree from Community Care College. Lynnsey has a love for all animals, but her favorite is her Shih Tzu named Layla. She was the runt of the litter of adorable puppies, and after weeks of begging, her husband finally agreed to welcome Layla to their family. It has been a non-stop adventure ever since.


Male animal clinic staff holding a dog


Receptionist/Veterinary Nurse

I own an assortment of pets from pups to birds, reptiles, fishes and axolotls.  In my spear time, I like to learn about different cultures and animals.  I also like to hang out with friends and going hiking and swimming at nearby Oklahoma lakes and surrounding states.



A female animal clinic staff holding a white dog



Kennel Technician

Animal Clinic Staff holding a dog.


Kennel Technician

Cat sitting on the couch


Milo Kitty

Clinic Kitty / Boss