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Contact Information Harvest Hills Veterinary Clinic
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We proudly serve veterinary patients in Oklahoma City, Yukon, Piedmont, Bethany, Edmond, Okarche, Warr Acres, Mustang, Kingfisher, El Reno, and the surrounding areas.

Hours of Operation
MONDAY: 7:30am - 6:00pm
TUESDAY: 7:30am - 6:00pm
WEDNESDAY: 7:30am - 6:00pm
THURSDAY: 7:30am - 6:00pm
FRIDAY: 7:30am - 6:00pm
SATURDAY: 8:00am - 12:00pm
SUNDAY: Closed
(405) 721-7090

Harvest Hills Veterinary Hospital, 8108 NW Expressway, Oklahoma City 73162

Hospital Staff

Mark Reser, D.V.M.

Dr. Mark ReserMark Reser, DVM Dr. Reser was born in Midwest City and raised in Oklahoma City. He attended Oklahoma State University where he received a Doctorate in Veterinary Medicine in 1998. After graduation he moved to Portland, OR, and eventually made it back to Oklahoma City in 2003 and came to Harvest Hills Vet Hospital in 2005.
He is married to Jennifer, has two sons, Wes and Isaac, and a well loved cat and dog. He has enjoyed a very diverse training as a veterinarian, working in two 24-hour emergency clinics, and a smaller general practice. His professional interests include internal medicine, rehabilitation, surgery, and wound management. In his spare time he spends as much time as possible playing with his kids and traveling.

Camille Sieger, D.V.M.

TerrienDr. Camille Sieger obtained her undergraduate degree at Southwest Missouri State University while completing the perquisite courses for admission to veterinary school. She was accepted to Oklahoma State in 2005 and graduated with her DVM degree in 2009. She then moved to Oklahoma City to start her career in a small animal practice. After a few years of performing relief work for various clinics around Oklahoma City, Dr. Sieger joined Harvest Hills Veterinary Hospital full time. Her interests in practice include internal medicine and preventive care through client education.
Dr. Sieger now lives in Moore with her husband, Tim. They welcomed their first son in November, 2012, but also share their home with three dogs, a cat and a snake. In her free time, she enjoys spending time with family, gardening, and horseback riding when she can make it home to Sapulpa.

Terrien Renfro

Veterinary Assistant
TerrienTerrien began working at Harvest Hills in February 2007 as a Kennel Technician then started training as a Veterinary Assistant to work alongside Dr. Reser. In conjunction with her hands on experience, she has also taken online courses from Stratford Career Institute in Veterinary Assisting. Terrien quickly illustrated a natural ability in caring for animals as well as working with fearful or nervous patients.
She shares her home with her boyfriend Terry and his daughter Cloe and their 5 pets. Her two dogs, Spike a lab mix and a crazy Great Dane mix named Zaney. She also has 3 cats, a Scottish fold mix named Cinder, a Siamese mix named Sundae, and a spastic Abyssinian named Phara. She enjoys gardening & spending time with her family. Her favorite part of working at Harvest Hills is how Dr. Reser educates his staff and clientele.


Veterinary Assistant
TerrienReagan Tullis has been a Vet Assistant at Harvest Hills Vet Hospital since 2009. She is married to the love of her life Josiah and they have 3 beautiful girls, Izzy, Sophie, and Evie.
Her many creatures include 3 weirdo cats named Tobias, ThunderCat, and Samcro, a snail named Brian Pickles, and a sweet old lady mutt named Willa. She also shares her home with the occasional rescue animal. Reagan enjoys spending time with her family, riding motorcycles, and crafting in her spare time.


Veterinary Assistant
TerrienChelsea began working for Harvest Hills in July of 2012 as a Veterinary Assistant. She has worked in the veterinary field for over 5 years. Chelsea enjoys assisting with surgeries, and helping animals. She has taken additional training with online courses in veterinary care and is always interested in furthering her education.
Chelsea was born and raised in Oklahoma, and has lived in Bethany the majority of her life. She currently lives in Yukon with her husband Steven and their two dogs. Currently they only have 4 legged kids, two boxers, Ty and Guinevere. Ty is a white boxer adopted from Red Dirt Boxer Rescue in March of 2012 and is the older of the two boxers. Ty enjoys playing with his laser toy, going to play Frisbee golf, and cuddling up in bed. Guinevere is a brindle boxer and is a year younger than Ty. Guinevere loves barking at everything, playing with her big brother and playing with her toys. In Chelsea’s spare time she loves to play with her dogs, spend time with her friends and family and ride her Yamaha YZ 250F dirt bike.

Lauren M.


Kyli McKinnon





Kennel Technician

Tyler B.

Kennel Technician

Kayla S.

Vet Tech