Meet Our Staff


Shawn Seibel, DVM

392765cd-7f00-0001-6226-1d06ad8e8382Dr. Seibel received a Bachelor of Science degree in Biomedical Sciences from Texas A&M University in 1999. He then went on to acquire his Doctor of Veterinary Medicine (DVM) degree from Texas A&M University in 2004. After completing his DVM degree, he completed a Small Animal Medicine and Surgery Internship at the University of Pennsylvania, Matthew J. Ryan Veterinary Teaching Hospital. After finishing his internship he moved to Parker, CO and started working at the Animal Emergency and Specialty Center in July 2005.  He worked there until opening Advanced Pet Care of Parker in July of 2009.

Dr. Seibel decided to open Advanced Pet Care of Parker because he wanted to offer the highest quality of care (similar to that found at specialty or referral hospitals) at a general practice. He believes all pet owners should be very involved with their pets care, be educated on their medical problems, and be involved in all their choices for treatment.

He enjoys spending time with his son and wife. They share their house with two spoiled-rotten dogs (Rosie and Scooby). His hobbies include wood working/building, photography, skiing, camping, and home improvements.


Marla Kriet, DVM

Marla Dr. Kriet grew up in the Denver and received her bachelor’s degree in zoology from Colorado State University in 1996 (Go Rams!).  She fulfilled a childhood dream when she received her DVM, also from CSU, in 2000.  Dr. Kriet always wanted a career working with animals and loves the challenge that medicine provides.  Dr. Kriet has special interest in geriatric care, dentistry, internal medicine and rehabilitation.  She is also a certified veterinary acupuncturist.  She and her husband, Bryan, have a daughter, Natalie, and they enjoy spending time in the mountains skiing and downhill mountain biking.  Dr. Kriet also enjoys reading, running and travelling to the beach.  The Kriets share their home with their 3 dogs–Avalanche, a golden retriever; Rexi, a Jack Russell; and Sally, a shih tzu.


Marissa, CVT, Practice Manager

BioMarissa has been a veterinary technician since 1997. She decided to make it official by attending Harcum College in Bryn Mawr, Pennsylvania. In 2001, Marissa graduated with honors from Harcum and passed the National Veterinary Technician Certification Exam. She also completed internships at the University of Pennsylvania’s New Bolton Center (Large Animal Hospital) and the Matthew J. Ryan Veterinary Teaching Hospital of the University of Pennsylvania (Small Animal Hospital). After graduation, Marissa left the land of General Practice, and accepted a veterinary nursing position in the Oncology Department at the Matthew J. Ryan Veterinary Teaching Hospital of the University of Pennsylvania. While there, she was able to perfect her venipuncture skill, administer chemotherapy, teach Veterinary Students, Veterinary Nursing Students, Interns, and Residents, as well as collect data for research projects. Marissa is also published as a co-author in the Journal of Veterinary Internal Medicine and Veterinary and Comparative Oncology.

Marissa moved to Parker in 2005. She worked at Central Veterinary Emergency Center at VRCC in Englewood for 1 year. In 2007, she began working for Veterinary Pet Insurance, processing the larger, more difficult claims, and acting as a trainer and mentor to new and current staff members. In February, 2014, Dr. Seibel was finally able to convince her to join the staff at Advanced Pet Care. While it is a huge change from her desk job, Marissa loves every minute! She enjoys talking with pet owners and spoiling their furry kids!

In her spare time, Marissa enjoys reading, baking, cake decorating and running. She enjoys participating in obstacle course races, mud runs, and has completed 2 half marathons. She is a fan of the Denver Broncos and the Dallas Cowboys! Marissa also enjoys spending time with her husband and son. They share their home with a pit bull and a mini poodle.


Kortney, Certified Veterinary Technician

KLBKortney has worked as a CVT since 2011. Originally from Nebraska, she came to Colorado to attend the Bel Rea Institute and become a Veterinary Technician. She has worked mostly in general practice, but has experience in emergency medicine as well.

When she is not working, she enjoys hiking and camping with her 4 dogs, and being out on the farm with her horse.








Ashley, Certified Veterinary Technician

Ashley I graduated from Bel Rea in 2014 after realizing human nursing was not my path. I have two dogs, Atilla, a boxer mix, and Kage, an akita mix. They are full of energy and love our time at the dog park and hiking. My husband and I love to cook together and my step son loves to eat it! I love being a technician and spreading animal knowledge!








Cora, Receptionist


Originally from Reno, Nevada, Cora moved to Colorado and received a Bachelor of Science degree in biology from Colorado State University. Cora enjoys spending time with her husband, her dogs and cats, and getting outside to take advantage of all that Colorado has to offer!