Technical Staff

All veterinary technicians at Animal Surgical Clinic of Seattle are licensed by the State of Washington, demonstrating their proficiency and expertise.

Teresa Casson

Licensed Veterinary Technician (Hospital Support Manager)

Teresa joined ASCS in 1997 after receiving her AA from Pierce College Veterinary Technology Program in Tacoma and completing a prestigious year-long internship at the Animal Medical Center in New York City. Teresa’s role here runs the gamut of scheduling, planning and coordinating the various events we host throughout the year, procuring sponsors for those events, booking venues, planning holiday parties, acting as liaison between our clinic and the Seattle Aquarium and Woodland Park Zoo and lending a benevolent ear to anyone with a problem! She has also raised three puppies for Canine Companions for Independence. Ultimately, only one made it through, but the others made wonderful pets.

When Teresa is not busy being our Number 1 cheerleader, she enjoys spending time with her grand kids,  gardening and sailing the San Juan’s in her finicky 40 footer.

She and her husband share their boat and their home with Hudson, a curious yellow Lab, who’s working on acquiring his sea legs.

Sari Lieberman

Licensed Veterinary Technician

Sari started her first career as a vocalist, traveling throughout the US, Canada and many of Caribbean Islands in a variety of venues. But her love of animals drew her to pursuit veterinary medicine. She  joined ASCS in 2000 after receiving her AA from Harcum College and interning at the University of Pennsylvania.

She particularly enjoys her role as resident gardener, social media maven for our clinic along with blogging, website maintenance, client communication and radiology. She is also in charge of instructing the many interns and externs that rotate through our clinic.

Sari shares her home with and Patty Cake, a feisty corgi/pom cross and Ramona, a terrier mix of some sort.

She enjoys  gardening, bicycling, paddle boarding, yoga, singing in the shower and impersonating her coworkers!

Jenny Dunn

Licensed Veterinary Technician

Jenny joined ASCS in 2000 after receiving her AA from Bel-Rea Institute of Animal Technology in Denver and interning at Alameda East Veterinary Hospital. Her particular interests are radiology and critical care of the surgical patient. She is our in-house pit bull expert and she shares her home with Salvador, her handsome pitty rescue.

Sarah Johnson

Licensed Veterinary Technician (Surgery/Nursing Coordinator)

After working for five years in general and emergency practice, Sarah came to ASCS as a relief assistant and moved to full-time in 2002. Shortly thereafter, she sat for and passed her boards to become a Licensed Veterinary Technician. As our surgery/nursing coordinator, Sarah makes sure that the day’s surgical cases run smoothly. Her particular interests are anesthetic pharmacology, surgical nursing, client education and instruction. She also conducts CE courses on veterinary anesthetic protocols.  She shares her home with her Great Danes, Moses and Edith, two cats, Dieter and Fat Hamster and a 10 year old Koi whom she has yet to name. In her spare time, Sarah competes in carriage-driving events with her three Friesian horses. She is Driving Division Director for Equestrian Institution NW, a 501C3 and has been on the board of directors for EINW since 2014. She also enjoys skiing and traveling the world.

Desiree Rickstrew

Licensed Veterinary Technician

Desiree actually started out in the cosmetology field, but having grown up on a ranch in a small town in Colorado, caring for an array of different animals, she knew her true calling was in veterinary medicine.

After graduating from Bel-Rea Institute of Technology in 2007 she worked in general practice for 4 years, then did a 2 year stint in veterinary oncology. But she always had an interest in the surgical side of veterinary medicine,  so she joined us in 2014 and hasn’t looked back!

Desiree loves camping, kayaking, hiking, entertaining friends in her backyard oasis and playing with her two very energetic German Shorthaired Pointers, Emmett and Wyatt, with whom she shares her home, along with long time boyfriend, Nick and her 17 year old Dachshund, Lexus. A gift for her 16th birthday!

 Hethir Pharr

Licensed Veterinary Technician

Hethir grew up in the Central Valley of California and attended Humbolt State University, majoring in literature and philosophy. She had a few stints at various jobs, including a barista and a projectionist at a small movie theatre, but it was  working at a spay and neuter clinic during a gap year that set the course of her life. She knew that veterinary medicine was where her heart was, so she moved up to Seattle for the rain and the trees in 1998 and started working at The Animal Eye Clinic where she remained until April of 2017.

Although she enjoyed her long, rewarding career at AEC, she was looking to challenge herself and since she always had an interest in surgery, she jumped at the chance to work for us when a position became available. And we’re very glad she did!

She keeps us on our toes with her literary prowess. (Many never get her references) and her calm yet quirky demeanor is a welcome asset in our fast-paced environment.

Hethir lives with her boyfriend, a cat named Birdie and a one-eyed dog named Elsie.

She enjoys reading–and reading–and did we mention–reading?

She also enjoys cooking tasty vegan dishes, camping, traveling, hiking and taking long walks with her doggie.

Bet Elsie loves that too!

 Leah Harrer,


Leah was born In Spokane, WA, endowed with an innate love of animals. Her mother explained that ever since she could talk, she told everyone she met that she was going to be a vegetarian—meaning, veterinarian, of course, although she dabbled with the former as well.

A month after graduating high school she started the veterinary technician program at PIMA and became licensed in 2011.

She worked in general practice for four years and volunteered at the Humane Society. During that time, she discovered her passion for surgery and anesthesia and felt her place was in the OR. So, when a position became available at our clinic, she jumped at the chance to become part of our team. And she hasn’t looked back.

She says she loves what she does and has no doubt that she’s found her calling. Her love of specialty medicine is inspiring her to consider taking it a step further and become certified as a Veterinary Technician Anesthetist.

She shares her home with a 2-year-old rescued cattle dog mix named Jazz, aka Mr. Jazzy Fizzle, quite the diva of a Netherland Dwarf bunny rabbit named Ninja, and newlywed husband, Justin.

She enjoys camping, spending time with family, lazy days, food and traveling.

Ever the animal lover, she spent time volunteering for an animal rescue while in the Dominican Republic on her honeymoon!