Leaders. Pioneers. Specialists.

Because it is our life’s calling.

Every day, we come in to work because we believe in pioneering higher standards of care for every single pet we see. This is a team of excellence. This is a team of innovation. This is the team by your side.

Specialty DoctorsEmergency Doctors
Mackenzie Adams, DACVS-LA

Mackenzie Adams, DACVS-LA

Surgeon

Mackenzie Adams, DACVS-LA, Surgeon

Dr. Mackenzie Adams is a native of Seattle and moved to San Francisco with her human and cat family. She attended veterinary school at Colorado State University and then pursued specialty training in Equine and Large Animal Surgery at Purdue University School of Veterinary Medicine. Realizing that her heart was with the smaller members of the animal kingdom, Dr. Adams has come back to the west coast to pursue small animal emergency medicine and small animal surgery. In her free time, Dr. Adams loves exploring the outdoors, running, and doing yoga. She is excited to be living in such an amazing and beautiful city.

Jill Williamson, DACVECC

Jill Williamson, DACVECC

Emergency and Critical Care

Dr. Jill Williamson, Board-Certified Emergency and Critical Care Specialist, Medical Director of Emergency and Specialty Services, and AIMSS Founder

After graduating from veterinary school in Iowa, Dr. Williamson headed to the west coast and has been in California ever since. She practiced in emergency and specialty hospitals in Northern California prior to starting her ACVECC residency in 2002. Dr. Williamson completed her residency in Emergency and Critical Care at the Pet Emergency and Specialty Center of East County in La Mesa, California.

Dr. Williamson puts her advanced skills in critical care to work when a pet’s condition becomes life threatening. After making an initial assessment, she stabilizes the patient, and then provides continuous support and monitoring based on patient needs. Life-saving therapy may require IV fluids, blood or plasma transfusions, mechanical ventilation, oxygen support, surgery, nutritional delivery, and pain control. Dr. Williamson delivers cutting-edge expertise with compassion and love.

“Critical care is the core of medicine; it requires intimate knowledge of physiology. Although deeply challenging on intellectual and emotional levels, critical care can be amazingly rewarding.”

Dr. Williamson spends her free time riding both road and mountain bikes, exploring the culinary scene of Northern California, and hiking.

Dorrie Black, DACVECC

Dorrie Black, DACVECC

Emergency and Critical Care

Dr. Dorrie Black, Board-Certified Emergency and Critical Care Specialist

Dr. Black is a fifth generation Californian, raised in Danville. After completing both her DVM and MPVM degrees at UC Davis and her small animal internship in San Diego, she went east to train in the field of veterinary emergency and critical care medicine at the University of Pennsylvania in Philadelphia.

“I specialized in emergency and critical care medicine to be the best veterinarian I could be for critically ill dogs and cats. I love the variety and different things that we see every day. No one single day is ever the same. I love the collaboration with my fellow veterinarians at AIMSS and seeing my patients get better.”

Her special areas of interest include respiratory diseases, coagulation disorders, and antimicrobial therapy. Dr. Black is widely published and speaks frequently on topics in emergency and critical care.

Dr. Black is thrilled to be back home in Northern California. When she is not at the hospital, she enjoys the great outdoors, especially trail running and kayaking. Her furry companions, Chloe, Butter, and Freeway, are at her side during her many adventures.

Sophie Dennison, DACVR

Sophie Dennison, DACVR

Radiology

Dr. Sophie Dennison, Board-Certified Radiologist and AIMSS Partner

Dr. Dennison performs ultrasound, radiography, CT, and MRI, providing noninvasive evaluations of the internal organs and allowing abnormalities to be identified and characterized. In many cases, the appropriate application of these scientific methods means that unnecessary surgery may be avoided.

Dr. Dennison states, “I love the hands-on approach of ultrasound services. I enjoy all aspects of diagnostic imaging and believe in employing state-of-the-art technology to achieve the most efficient and appropriate imaging for the accurate diagnosis of the individual patient.”

As Medical Director of Specialty Services, Dr. Dennison provides guidance, oversight, and quality assurance for patients under the care of the board-certified specialists at AIMSS. She promotes ongoing education of specialists to ensure that practices are based on the newest research and technology. She uses her broad range of expertise to work with the team of specialists to develop the appropriate treatment plan for optimal care.

A native of the UK, Dr. Dennison received her veterinary training at the University of Edinburgh. She completed her radiology residency at the University of Wisconsin School of Veterinary Medicine and achieved board certification in Small Animal Radiology in 2009.

Skilled in the diagnostic imaging of domestic, avian, and marine mammal species, she is widely published and consults locally, nationally, and internationally on cross-sectional imaging cases.

When not working, Dr. Dennison enjoys skiing, playing ice hockey, and hiking. She also loves watching British TV and hanging out with her two cavaliers, Brie and Devon.

Cheri Nielsen, DACVS

Cheri Nielsen, DACVS

Small Animal Surgeon

Dr. Cheri Nielsen, Board Certified Small Animal Surgeon

Dr. Nielsen earned an undergraduate degree in biomedical engineering with a minor in applied mathematics. It wasn’t until her second year of medical school at the Johns Hopkins School of Medicine, when her own dog needed the services of a surgical specialist, that she became aware of veterinary surgery as a career option. This opened the door to a life-changing decision; she left Johns Hopkins to pursue a veterinary career. She earned her DVM degree at UC Davis while concurrently completing an MS degree in biomedical engineering then continued on to a one-year clinical internship at Colorado State University. She completed a three-year surgical residency at the University of Minnesota and successfully fulfilled the rigorous credentialing and examination requirements to become a Diplomate of the American College of Veterinary Surgeons in small animal surgery.”

Dr. Nielsen has been providing innovative and compassionate specialty surgical care for bay area pets since 2006. She is skilled in a wide range of procedures and her surgical practice includes orthopedic, neurologic, soft tissue, and oncologic/reconstructive surgery. Patient comfort and client communication are top priorities for Dr. Nielsen, who has a particular passion for minimally invasive procedures, wound management, and cancer.

Katharine Andres, DACVIM

Katharine Andres, DACVIM

Oncology

Dr. Katharine Andres, DVM, DACVIM/Oncology

Dr. Kathy Andres graduated from UC Davis School of Veterinary Medicine with honors and completed a small animal internship at the Animal Medical Center in New York City. After several years of family and emergency practice in the San Francisco Bay Area, Dr. Andres fulfilled her dream of becoming a veterinary oncologist through her residency in oncology at BAVS and achieving board certification in 2011. She has received numerous awards during her academic and clinical training acknowledging her gentle approach to pets and their families and her special interest in the field of oncology.

At work, Dr. Andres enjoys collaborating and learning from her veterinary colleagues. She develops long-term relationships with her clients and patients and loves to hear their stories while developing therapy plans that meet the needs of the family and of the patient.

Originally from the East Coast, Dr. Andres lives in her beloved San Francisco with her family including several dogs, a cat and multiple parrots. She enjoys being silly with kids, home remodeling, cooking and reading late into the night.

Nate Tong, DACVR

Nate Tong, DACVR

Radiology

Dr. Nate Tong, DACVR, Radiology

Bio Coming Soon!

Ashley Elbogen

Ashley Elbogen

DVM

Bio coming soon.

Robin Kelly

Robin Kelly

DVM

Dr. Kelly completed veterinary School at UC Davis before entering private practice after additional internship training at Bay Area Veterinary Specialists. She enjoys all aspects of emergency medicine and especially enjoys all things related to eyes! Her interest in ophthalmology may lead to specialty training in the future. When she is not at work, Dr. Kelly enjoys riding horses and exploring our beautiful city.

Melissa Ryce

Melissa Ryce

DVM

Dr. Ryce is a Bay Area native but went to college in New Orleans, which she called home for many years. After being displaced by Hurricane Katrina she moved to higher ground in the California Sierra Foothills and worked as a veterinary ER nurse. She went to vet school at St. Matthew’s University in Grand Cayman and performed her clinical year at the University of Illinois and at UC Davis. After graduating from vet school she operated the only emergency clinic in the city of New Orleans for a year before returning to her beloved San Francisco Bay Area. She has worked at San Francisco and Peninsula hospitals since 2015, including Animal Internal Medicine and Specialty Services in San Francisco and San Mateo, and Millbrae Pet Hospital. She loves the fast pace and gratification of emergency room medicine but also loves to be able to provide wellness and care for pets young and old in general practice. When Dr. Ryce isn’t practicing veterinary medicine she enjoys horseback riding, exploring nature, cooking, and the many musical offerings of our culturally diverse Bay Area.

Megan Snyder

Megan Snyder

DVM

Dr. Snyder began her career in the liberal arts, earning her Bachelor’s degree in English from the University of Illinois at Chicago, followed by a Master’s degree in film and video from The American University in Washington, DC. After completing her Ph.D., she taught English and English as a Second Language for several years before embarking on a new career in veterinary medicine.

She completed her degree at the Virginia-Maryland Regional College of Veterinary Medicine and has worked exclusively at specialty practices since graduation, allowing her to collaborate with and learn from specialists in emergency and critical care, surgery, internal medicine, neurology, and others.

In her spare time, Dr. Snyder enjoys traveling, fiber arts (knitting, crochet, tatting, and spinning), and spending time in local cafes.

She will admit to being owned by a sketchy cattle dog, a beagle mix, and a domestic shorthair.

Kate Maynard

Kate Maynard

DVM

Dr. Maynard took an unusual path to veterinary medicine. As the first to go to college she initially studied psychology; earning a bachelors and a masters. But, in her first year practicing as a therapist, she began volunteering as a kennel assistant at a nearby vet clinic. Here, she fell in love, was encouraged to become a vet and changed direction completely.

She spent another 2 years on pre-rec sciences at night school, 3 years of veterinary school at St. George’s University in the Southern Caribbean, 1 year of clinics in Tennessee and 1 year at a rotating internship in West Los Angeles focused on ER and Internal Medicine.

She enjoys international travel and cuisine, home improvement, reading, documentaries, and collecting sloths.

Dr. Maynard joined us in 2019. She still lives in Los Angeles with her husband, dog and 2 cats but flies to San Francisco several times per month to work specifically for AIMSS.

She says the clientele of AIMSS are so kind and respectful. They make the darker sides of this job a little brighter and allow her to be the best doctor possible.

Leah Kramer

Leah Kramer

DVM

Bio Coming Soon!

“Do not follow where the path may lead. Go instead where there is no path and leave a trail.”

-Ralph Waldo Emerson

Leadership

Katie Corrigan

Katie Corrigan

CFO

Bio Coming Soon.

Katie Hayes

Katie Hayes

Lead Financial & Medical Coordinator

Bio Coming Soon.

Hannah Olsen

Hannah Olsen

Client Service Manager

Bio Coming Soon.

Ray Gonzales

Ray Gonzales

COO

Ray has held many roles in the corporate world including Operations, Marketing, Purchasing, Contract Negotiations, and Human Resources. Ray has owned and operated several business in the past and is also the founder and past President of East Bay Animal Rescue & Refuge (EBARR), a 501c3, all volunteer animal welfare organization in the East Bay. Ray has over 25 years experience in small business and corporate sectors and enjoys working with people and seeing them develop and grow professionally and personally.

Ray enjoys spending time with his family and all the animals he calls his own. He enjoys golf and never misses a UCLA Football game. Ray is a graduate of Arizona State University with a Bachelor of Science in Political Science.

Emily Chryst

Emily Chryst

Nursing Manager

Since her first introduction to veterinary medicine, Emily has found the challenge of emergency and critical care to be the most rewarding aspect of her job. She has spent her career providing intensive nursing care to the most critical pets in the hospital, developing a particular interest in respiratory therapy, anesthesia and metabolic disorders. After spending so much time by her patients’ side, she loves seeing their faces light up when they get to go home! Emily enjoys sharing her passion for critical care medicine with her team at AIMSS and by lecturing and contributing to publications for veterinary professionals.

When she is not working, Emily can be found on a never-ending quest to wear out her three inexhaustible cattle dogs in the wilderness of California. She also enjoys cooking, gardening, and curling up with a book and her two lazy cats.