Jonathan Wisniewski

Practice Owner, DVM

Education: Oregon State University.

Hometown: Sherwood, Oregon.

Pets: Gizmo and Bullet (Dogs); Reef aquarium (mixed reef with corals, fish and invertebrates)

Dr. Jonathan Wisniewski received his undergraduate degree (Bachelors of Arts) from Claremont McKenna College in 2007 and completed his Doctorate of Veterinary Medicine in 2011 from Oregon State University. After graduating from Oregon State University, Jon completed a rotating small animal internship at Fifth Avenue Veterinary Specialists in New York, New York. Following his internship, Jon began working as an emergency veterinarian in Eugene, Oregon at the Emergency Veterinary Hospital and spent several years in the Eugene/Springfield area. During his time in Eugene, Jon also worked part time at the Emergency Veterinary Clinic of Tualatin. He came on as a full time veterinarian in July 2014 and has been working at EVCOT since that time. He is an avid aquarist and spends much of his free time observing and caring for the inhabitants of a mixed reef aquarium at home with dozens of species of coral, marine invertebrates and fish. He also lives with two dogs, a blue heeler mix named Bullet and a Shih Tzu named Gizmo (aka Gizmoto).

Dr. Jonathan Wisniewski assumed ownership upon passing of his mother, JoAnne Wisniewski, on December 29, 2018. He will continue to run and manage the practice in his mother’s memory as a family business. He is committed to providing affordable emergency services and compassionate medicine. He believes firmly in treating his employees fairly and with respect and is committed to making the emergency experience as stress free as possible for the clients and family members of the pets that we treat.

Jamie Warren

Medical Director, DVM

Education: Kansas State University

Hometown: Corbett, Oregon

Dr. Jamie Warren was raised in the beautiful, scenic community of Corbett, Oregon. Located in the Columbia River Gorge, this rural backdrop was a perfect place to care for a menagerie of family pets, including chickens, horses, a llama, cats, cockatiels and even a box turtle. Exposure to a variety of animals and first-hand experience with the human-animal bond cultivated her desire to become a veterinarian from a very young age. After graduation from high school, Dr. Warren attended Oregon State University and completed a Bachelor’s of science in Animal Science in 2004. Dr. Warren received her Doctorate of Veterinary Medicine from Kansas State University in 2008, graduating as summa cum laude, the highest academic honor awarded.

Fueled by the desire to be a knowledgeable, experienced, and compassionate veterinarian, Dr. Warren was accepted to one of the country’s top veterinary internships at the Animal Medical Center in New York City. Upon receiving her certificate of completion from this intense program and winning the “Intern of the Year” award, Dr. Warren was fortunate to finally return home to the beautiful state of Oregon.

Dr. Warren has a passion for emergency medicine and has exclusively practiced emergency and critical care since returning home to Oregon in 2009. She has a strong interest in diagnostic ultrasound, emergency surgery, and medical management of the critically ill patient.

Reza Sadreddin


Education: St. George’s University.

Pets: Rex (Miniature American Eskimo).

Dr. Reza Sadreddin received his Associate degree in Veterinary Technology from Portland Community College in 2009 and worked as a Certified Veterinary Technician at several animal hospitals in Beaverton area. He received his Bachelor of Science from Oregon State University in 2012 and obtained his Doctorate of Veterinary Medicine from St. George’s University in 2017. He completed his clinical year of his veterinary education at Oregon State University. Dr. Reza became interested in emergency medicine when he first joined Emergency Veterinary Clinic of Tualatin as a CVT in 2015. He enjoys all aspects of veterinary medicine and extremely values human-animal bond. He lives in Beaverton with his wife Razieh and their dog Rex. He spends his free time with his family, and enjoys outdoors, fishing, camping, traveling, handcrafting, drawing and gardening.

Rob Siefken


Dr. Rob Siefken grew up in neighboring Lake Oswego with several dogs, cats and fish. He remembers the compassionate care his pets and family received on several visits to EVCOT. Today, he enjoys working alongside several colleagues he met as a child. Rob discovered he had a gift with animals and he pursued a career in veterinary medicine, receiving his DVM from Oregon State University in 2014.Emergency medicine is often very fast paced with the first priority of stabilizing the patient. Dr. Siefken prides himself in identifying many of the latest treatment options and explaining them in an understandable way to the owners. Dr. Siefken enjoys surgical procedures (when appropriate) and has removed socks, quarters, and teddy bear parts from plugged digestive tracks. In his spare time, Dr. Siefken enjoys cooking and traveling with his family. His family consists of wife Kamille, their daughter Gwen and two elderly dogs Henry (a black Lab) and Delilah (a 3-legged Chihuahua rescue). Henry no longer plays fetch due to his aging joints and is content cleaning up the kitchen floor after Gwen’s dinner. Delilah often plays hide-n-seek with Gwen and prefers the hiding part.

Ali McKay


Dr. Ali McKay is a native of Oregon and attended Eastern Oregon University and graduated with her Bachelors Degree in Biochemistry in 2007. She then attended Oregon State University and achieved her DVM in 2013. After veterinary school, she completed a rotating small animal medicine and surgery internship at Washington State University, followed by a surgical internship at Las Vegas Veterinary Specialty Center and a second surgical internship at Pieper Memorial Veterinary Center in Connecticut, completing her studies in 2017.

Outside of veterinary medicine, Dr. McKay stays busy with her daughter and their many animals, including ten cats, numerous reptiles, and their dog Ranger. Dr. McKay also enjoys visiting breweries, wineries, and is a member of a Salem dragon boat team.

Jeni Suubi


Education: Oregon State University DVM, Oberlin College BA (Dance)

Dr. Jeni Suubi graduated with her Doctorate of Veterinary Medicine from Oregon State University in 2010. Returning to her Alaskan roots after graduation, she practiced general medicine, dentistry and surgery. With a desire to be near family, and start an animal sanctuary, she settled on the Oregon coast, where she spent a decade at an urgent care clinic, nurturing her love for emergency medicine and surgery. She joined forces with the Emergency Veterinary Clinic of Tualatin team in 2021.
In her free time, Dr Suubi homesteads on her sprawling 20-acre forest, runs the dogs to the creek, and builds wood structures and habitats for the cats. She is grateful for her partner and son, who are tolerant of the many animals, and her channeling of Radagast the Brown. She loves to meditate and dance, and explore the wineries alongside Dr McKay.

Michelle Evans


Kamm Prongay, DVM

Relief Veterinarian

Dr. Kamm Prongay received her Bachelors of Arts from Whitman College in 1985. She spent the next five years at sea with the US Navy, before coming ashore. She graduated from Washington State University in 1997, received her American Board of Veterinary Practitioners (Canine and Feline) specialty in 2008, and completed a post-doctoral Master of Clinical Research at Oregon Health & Science University in 2013.

Dr. Prongay has been interested in emergency medicine her entire career, and has provided relief services at Emergency Veterinary Clinical of Tualatin since 2008. When not seeing patients, you will find her writing, volunteering in Forest Park, or serving as an Oregon Naturalist. She lives in Portland with her wife, Liz, and two loving (but demanding) felines.

Greg Bishop, DVM

Relief Veterinarian

Greg Bishop graduated from UC Davis Veterinary School in 2013 and completed a one-year clinical internship at a specialty hospital in New York before returning to the west coast. He has practiced in emergency and general practice for over ten years, and also teaches at the Veterinary Technology program at Portland Community College. In his non-work life, he enjoys outdoor time with his family, drawing/writing/building or anything creative, and observing crow behavior at his local park.

Sara Livesay, DVM

Relief Veterinarian

Dr. Sara Livesay graduated with her Doctorate of Veterinary Medicine from Oregon State University in 2013. Dr. Livesay spent several years in a mixed animal practice on the southern Oregon coast before moving back to the Willamette Valley. She is very passionate about helping animals in underserved areas and has traveled all over the world providing veterinary care to animals in need. Dr. Livesay has a diverse array of professional interests including surgery, especially spay/neuter, dermatology, and hospice care. In her free time she is often found exploring new hiking trails, paddling the river with her dragonboat team, and taking long walks with her rescue pup Raider.

Nicole Chamberlin, DVM

Nicole Chamberlin is a 2000 graduate of the Oregon State and Washington State joint veterinary medicine program. Her undergraduate studies at Reed College brought her to Portland from Alaska. She has worked at multiple small animal practices in the Portland area and at EVCOT in part time time and currently full time capacities since 2017. She has served on the board of the Portland Veterinary Medical Association (PVMA) and is a member of the PVMA, American Veterinary Medical Association and the American Veterinary Veterinary Emergency and Critical Care Society. She has volunteered with PAW Team and the Feral Cat Coalition of Oregon. She shares her home with her spouse, adult children and 4 cats. In her free time, she enjoys gardening, wine tasting, travel and spending time with friends and family.

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