Dr. Lori Bradshaw moved to the Pacific Northwest after obtaining her veterinary degree from Cornell University and completing an internship at Mississippi State University. Her special interests include toxicology, metabolic and gastrointestinal diseases, feline lower urinary disease, and blood disorders. 

When not at work, Dr. Bradshaw enjoys spending time with her husband, Andrew, their often colorful Shih Tzu, Shadow, and her running partner Clara, a German Shorthaired Lab. 


Medical Director



Medical Director 

Dr. Crowley was born and raised in Portland, Oregon. She attended Oregon State University for both her Bachelors degree in Animal Science and her Doctorate of Veterinary Medicine. Ashley loves all of her job but is most passionate about soft tissue surgery, metabolic disease, and trauma cases. 

When away from work she spends her time with her husband and their son. Together they adventure with Rogue, a thirteen-year-old English Springer Spaniel, and Pike, a three-year-old Nova Scotia Duck Toller. She has also rescued two cats, Philip J Fry and Slash. 

Dr. Gerard graduated from Oregon State University in 2007 in the same veterinary class as Dr. Thomas.  She did a post-doctoral internship in medicine and surgery at New York Veterinary Specialists in Manhattan, NY, before going on to work relief for over 25 different hospitals in the NY metro area.  She did a fellowship at a zoo in NY state for 2 years and enjoys working with exotic animals and wildlife, as each species poses a unique challenge and learning opportunity.


After doing a few years in private practice, Dr. Gerard realized that her niche is in emergency and critical care work as she likes the fast paced days filled with every challenge imaginable.  After moving back to the Portland area in 2013, Dr. Gerard has been working for Tanasbourne Veterinary Emergency full-time.


In her spare time she enjoys cooking, reading and spending time outside with her husband and two dogs.



Dr. Rivaleau is a Clemson and Auburn graduate (Go Tigers!) who came to us during her preceptorship and loved the city and clinic so much she decided to stay! Her favorite activities in her time off are the usual PNW favorites - hiking, yoga, trying local beer, and attempting to keep her garden alive. She lives in North Portland with her own TVER-rescued cat, and hopefully one day a Great Dane and English lab, too. 

A graduate of Oregon State and a Portland native, Dr. Goranson came to TVER in 2016 with his classmate, Dr. Crowley. His professional interests include surgery (soft tissue and orthopedics/fracture repair) with a special interest in complex wound repairs. When not in surgery, he spends his time working on renovating his 115 year old house and spending time with his wife, two sons, 3 legged cat (Myrtle), parvo-doodle (Babka) and their latest addition, Egg the Pomsky


Practice Owner

Dr. Thomas opened Tanasbourne Vet ER in 2011 and has been working tirelessly since to help it grow into the practice it is today. 

His professional interests include surgery (both soft tissue and orthopedics). During his career, he has learned how to perform many complicated soft tissues surgeries, such as liver lobe resections, perineal urethrostomies (PU) and cholecystectomies. Additionally, he is the resident orthopedic expert, performing numerous orthopedic procedures including fracture repairs and TPLOs (corrective procedure for dogs who tear their cruciate ligaments). 

When not working, he enjoys spending time with wife, two children and herd of animals. 



Dr. Cheryl Roth graduated from the University of Nevada, Reno in 2000 with a BS in Biology and from Colorado State University in 2004 with her Doctor of Veterinary Medicine degree.  After graduation, she practiced in Springfield, Vermont for four years while her husband attended medical school.  They then moved to the Twin Cities, Minnesota.  After 7 years in general practice, Dr. Roth moved to exclusively emergency and critical care practice.  In 2012, she passed her boards to become a specialist in Canine and Feline Practice.  Looking to defrost, she moved to Oregon and joined the staff at Tanasbourne Veterinary Emergency in 2016.  Her areas of special interest include endocrinology, kidney disease, toxicology, and bed-side ultrasound use in the ER.  She also oversees the new donor blood bank here at TVER.

Dr. Roth shares her home with her husband, Eric - a human ER physician and their three children (Aidan, Emily and Owen).  In addition, to their two legged children, they also have three dogs (Molly - a Great Pyrenees rescue; Isaac Newton - a less than genius Golden Retriever; and Bisou - a French Bulldog rescued during a trip to Thailand), three rescued cats (Snow, Camilla, and Midnight), and a Herman’s tortoise (Leo).  In her free time, Cheryl enjoys playing alto saxophone in the Beaverton Community Band and traveling with her family.



Kellie Kietzman, DVM, cVMA, completed her bachelor's degree in animal science at California State Polytechnic University, Pomona.  She received her doctorate of veterinary medicine from Oregon State University.  Dr. Kietzman has practiced at Tanasbourne Veterinary Emergency since April 2019.  She is certified in small animal veterinary medical acupuncture (cVMA) since October 2015. Her special interests include feline medicine, pain management, and complementary/integrative therapies (acupunucture, laser therapy, rehabilitation, hyperbaric oxygen therapy, etc.).  On her time off, she enjoys reading, cooking, hiking, and camping.  She lives in Portland with her husband, son, golden retriever, and two cats.



Even when your pet is healthy, Veterinary Diagnostic Labs are an important part of keeping them in the best possible condition. Contact us to learn more about our services and how you can contribute to your animal’s optimal health.

Dr. Laura Niman was born and raised in Portland, Oregon. Growing up she loved animals and spent many hours volunteering at the Oregon Humane Society. Most of her family, friends and neighbors knew she would be a veterinarian before she did! Dr. Niman received her Bachelor’s degree in Psychology at Whitman College in Walla Walla, WA. At the same time, she also completed the required pre-veterinary science courses and worked at a veterinary hospital, knowing that becoming a veterinarian was her true calling. After graduation she was accepted to Oregon State University for veterinary school and graduated at the top of her class. 

Following veterinary school, Dr. Niman completed a year-long internship in small animal medicine and surgery at WestVet Emergency and Specialty Center in Boise, Idaho. During this internship Dr. Niman discovered a passion for emergency and critical care medicine. She practiced for 4 years at the Emergency Veterinary Hospital in Springfield, Oregon before deciding to return to her hometown and joining the team at Tanasbourne Veterinary Emergency in 2019. 

In her spare time, Dr. Niman enjoys reading, hiking, yoga and traveling. She also loves a quiet night with a good movie, a cup of tea and a knitting project. She shares her home with her fiance, two small mixed-breed dogs and two house rabbits. 

At Wix.com, we are fully committed to your pet’s health and happiness. That’s why we recommend bringing them in for regular Pet Wellness Exams. By doing so, we’ll be able to treat issues before they arise.


Dr DeDionisio is a graduate of Oregon State University College of Veterinary Medicine. She’s originally from Pennsylvania but has called Oregon her home for 7 years now. Her favorite patients are misunderstood little angry dogs. When she’s not working you can find her tending to her plants, being a fun auntie, and spending time with her fur kids Pippa and Tuna. 


As caring owners, you want the very best for your pet. That’s why we encourage you to schedule regular Emergency Care Services. By seeking to prevent problems before they arise, you’re ensuring your pet extended health and happiness.

Fax: (503) 629-5877

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