Meet The PASE Team

Dr. Al Staab

Brett Harling, DVM

Practice Limited to Internal Medicine
Head of Specialty Services

Brett Harling, DVM, is an internist, managing partner, and head of the specialty services at Philadelphia Animal Specialty and Emergency (PASE).

Dr. Harling is a Florida native and completed his Bachelor of Animal Sciences as a gator at the University of Florida. He obtained his Doctor of Veterinary Medicine at St. George’s University, completing three years in Grenada and a clinical year at Ohio State University. After graduation, he completed a small animal rotating medicine and surgery internship at The Animal Medical Center (AMC) in New York City, a specialty internal medicine internship at Animal Specialty Group in LA, a one-year program specializing in minimally invasive diagnostic and therapeutic procedures with the AMC Interventional Radiology and Endoscopy service, and three-year Internal Medicine residency at AMC. Following residency, Dr. Harling worked at MedVet Chicago, practicing internal medicine and establishing an interventional radiology and endoscopy service prior to moving back to the northeast to dedicate his focus towards creating PASE.

In understanding the rapidly changing and advancing veterinary field, he advocates for life-long learning with integration of innovative technology and novel treatment options to practice the highest quality of medicine. Throughout his teaching, Dr. Harling feels lucky to have had many strong influences, often guided by those considered to be leading minds within their respective specialties. Keeping an open ear and open mind has allowed him to gain unique insight, and he has a strong desire to inspire the same passion he has for learning in those around him.

Dr. Harling's professional interests include endoscopy, interventional radiology (minimally invasive diagnostics and treatments for complicated disease processes), management of critically ill patients, and treatment of endocrine diseases (such as diabetes, Cushing's disease, hyperthyroidism, etc.) while developing strong relationships with patients and clients. When not in the hospital, Dr. Harling enjoys playing tennis, exercising with his wife (sometimes), and exploring new areas on runs and hikes. His family includes a spicy Torti cat named Petry and two rescue Frenchies, Kobe and Tofu.

Emily Dozeman, DVM, DACVECC

Emergency & Critical Care

Co-Head of Critical Care​​​​​​​

Emily Dozeman, DVM, DACVECC is a board-certified emergency and critical care doctor. She is one of the managing partners and co-department chair of the emergency and critical care service at Philadelphia Animal Specialty and Emergency.

Dr. Dozeman attended the Ohio State University where she earned a Bachelor of Animal Science and a Doctor of Veterinary Medicine degree. Following veterinary school, Dr. Dozeman completed a small animal rotating medicine and surgery internship at VCA SouthPaws in Fairfax, VA. She then worked as an emergency doctor in Chicago before deciding to pursue a residency. Dr. Dozeman completed a three-year residency at The Animal Medical Center in NYC.

Dr. Dozeman is experienced in all aspects of emergency medicine and critical care with a particular interest in the management of polytrauma patients, sepsis, and transfusion medicine. She has published multiple articles in The Journal of Veterinary Emergency and Critical Care on whole-body computed tomography in the polytrauma patient. Dr. Dozeman also has a special interest in brachycephalic syndrome and airway management for respiratory crisis (not to mention she owns two french bulldogs herself).

While the excitement of the emergency room and dynamic, challenging cases are the reason Dr. Dozeman has pursued this specialty she also feels that the human-animal bond is one of the main reasons she became a veterinarian. She enjoys being able to make a difference and help families make the best decisions for their pets. Dr. Dozeman also has a special interest in humane law enforcement and being involved with local rescue groups.

When not treating patients, Dr. Dozeman enjoys being outdoors, spending time with her husband, Brett, and being active. She has two rescue French bulldogs and a cat named Petry.

Erik Zager, DVM, DACVECC

Emergency & Critical Care

Co-Head of Critical Care​​​​​​​

Erik Zager, DVM, DACVECC is a board-certified Emergency and Critical Care specialist, managing partner, and co-department head of the Emergency and Critical Care services at Philadelphia Animal Specialty and Emergency (PASE).

Dr. Zager attended Bucknell University in Pennsylvania where he earned a bachelor of arts in animal behavior. He went on to Cornell University for his doctor of veterinary medicine. After earning his DVM in 2013 he completed a rotating internship in small animal medicine and surgery at the New York City Animal Medical Center. He followed his rotating internship with a specialty internship in emergency and critical care at Tufts University in Massachusetts. He returned to Cornell University for his 3-year emergency and critical care residency. Following his residency, Dr. Zager moved to Hong Kong to set up a critical care department at one of Asia’s few veterinary specialty hospitals. After 3 years in Hong Kong, Dr. Zager returned to the USA to be part of the exciting new PASE team.

Dr. Zager has presented at the International Veterinary Emergency and Critical Care Symposium and has authored and co-authored articles in veterinary journals. During his veterinary education, Dr. Zager participated in multiple community-focused veterinary endeavors, including trips to rural areas of the American Midwest to provide wellness and preventative medicine to disadvantaged communities.

Dr. Zager’s professional interests include the treatment of sepsis, endocrine emergencies, intoxications, and the use of focused ultrasound in the critically ill. Outside of work he enjoys traveling, hiking, and baking. He has two 2 rescue cats, Brando and Otto.

Samuel Hurcombe, BSc, BVMS, MS, DACVECC, DACVIM-LA

Critical Care

Bio Coming Soon

Adam Yoskowitz, VMD, DACVR

Head of Diagnostic Imaging

Adam Yoskowitz, VMD, DACVR is a veterinary radiologist, managing partner, and head of Diagnostic Imaging services at Philadelphia Animal Specialty and Emergency (PASE).

Dr. Yoskowitz grew up in the suburbs of New York City. He completed his Bachelor of Science in Animal Sciences at the University of Delaware and obtained his Doctor of Veterinary Medicine (VMD), here in Philly at the University of Pennsylvania. Following veterinary school, he completed a one year rotating medicine and surgery internship at The Animal Medical Center (AMC) in New York CIty, where he trained alongside several of the other members of the PASE team. He then moved back to Philadelphia for a three year Radiology Residency at the University of Pennsylvania. After this, Dr. Yoskowitz spent 4 years as a radiologist for a large specialty hospital group in New York City. He is excited to be back in Philadelphia again... this time to help build PASE's new specialty practice!

Dr. Yoskowitz offers a wide variety of diagnostic imaging services including radiograph interpretation, diagnostic ultrasound, and interpretation of computed tomography (CT) and magnetic resonance imaging (MRI). He is an expert in image guided procedures such as ultrasound guided fine needle aspiration and biopsies and parathyroid ablation. He has a particular interest in musculoskeletal ultrasound and MRI. Currently PASE is offering on site x-ray and ultrasound services, and will have CT and MRI capabilities in the new facility in 2022. PASE currently has limited outpatient ultrasound services and will be rolling out teleradiology services in the very near future.

Patricia Mundy, VetMB, MRCVS, DACVO


Dr. Patricia Mundy is our veterinary ophthalmologist, available to perform advanced ophthalmic surgeries. Dr. Mundy earned her Doctorate in Veterinary Medicine degree from Cambridge University in 2005, followed by completing a rotating small animal internship at The Royal Veterinary College in London, England.

Dr. Mundy pursued her interest in ophthalmology by completing a prestigious Fellowship in Comparative Ophthalmic Pathology (COPLOW) at the University of Wisconsin Veterinary / Medical School in 2008. She is one of 22 people worldwide who have been awarded a COPLOW fellowship. Mundy completed a Comparative Ophthalmology Residency at Cornell University in 2012.

Dr. Mundy's interests include clinical, surgical, and comparative ophthalmology as well as ocular neoplastic and inflammatory processes. In her spare time, Mundy enjoys walking her dog Lady Charlotte, participating as an avid member of the sailing community, and enjoying her adventures as an equestrian.

Weihow Hsue, DVM, DACVIM


Dr. Hsue completed veterinary school at the University of California-Davis. He subsequently underwent a year-long small animal rotating medicine and surgery internship at the Ohio State University, and then returned to the University of California-Davis for his 3-year cardiology residency. In the following year, Dr. Hsue pursued a translational research fellowship at the University of Pennsylvania to explore and expand his interests in cardiac electrophysiology and arrhythmic diseases (abnormal heart rhythms).

Dr. Hsue’s professional interests include arrhythmias and the structural and molecular basis of heart disease. He enjoys immersing in other cultures and developing an inclusive and equitable community, having served in the Peace Corps in West Africa, worked on a local farm in Ecuador, and is currently functioning as the Research and Publications Committee Chair for the Multicultural Veterinary Medical Association.

In his spare time, Dr. Hsue enjoys going on backpacking trips with his dog, Diva. Despite being a rescue Chihuahua, Diva has no problems climbing over mountains and cozying up by the campfire.

Michaela Gruenheid, DVM, MS, DACVS-SA


Bio Coming Soon

S. Bryce Dooley, DVM, MS, DACVAA


Bio Coming Soon

Stephanie Wolstenholme, VMD

Head of Emergency Services

​​​​​​​Stephanie Wolstenholme, VMD, grew up outside of Philadelphia in Doylestown, PA. She knew she wanted to be a vet since she was 5 years old (right after "olympic horseback rider" didn't pan out). She graduated from Penn State main campus with a Bachelor's in Animal Science and then went to University of Pennsylvania for veterinary school. Following this she did a one year rotating internship in small animals and exotics at the Animal Medical Center (AMC) in New York City and then stayed on there to complete a subsequent specialty internship in Emergency and Critical Care.

Dr. Wolstenholme has been practicing as an ER doctor for the past several years, initially going to a private specialty and referral practice in New Jersey and most recently having worked in the ER at the University of Pennsylvania's veterinary teaching hospital. She thrives on the (at times) hectic nature of the ER and enjoys the varied caseload it provides.

When not at work Dr. Wolstenholme enjoys spending time with her husband and friends, traveling, running, fostering kittens and is an avid gardener. She has a rescue pit bull (Olive), two one-eyed cats (Davey Jones and Capn Jack) and several reptiles.

Alexis Perez, DVM

​​​​​​​Emergency Doctor

Dr. Alexis Perez is a Chicago native who received a Bachelor's Degree in Gender and Women's Studies from the University of Illinois at Chicago. She received her DVM from the University of Illinois at Urbana-Champaign College of Veterinary Medicine. During her time at U of I (instead of sleeping), she worked part time in their Wildlife Medical Clinic and Clinical Pathology Laboratory.

Following graduation she completed a one-year small animal rotating internship at the Veterinary Emergency and Referral Group in Brooklyn, New York. Since migrating to Philadelphia, she has worked as an emergency clinician for the past few years. Her clinical interests include ocular emergencies, urinary obstructions, and being able to provide affordable veterinary care to the community.

During Dr. Perez's veterinary career, she has volunteered time with marine mammals in the Cayman Islands, elephants in Thailand, and domestic animals in Nicaragua. When not traveling, she enjoys catering to her two tiny rescue dogs, Ethan and River.

Caitlin Weiser, VMD

​​​​​​​Emergency Doctor

​​​​​​​Dr. Caitlin Weiser grew up in Buffalo, NY where she received her B.S. in biology and ABEC (animal behavior, ecology, and conservation) from Canisius College. She then relocated to Philadelphia where she graduated with her VMD from the University of Pennsylvania in 2021. During her time there, she was an active member of the feline club and developed a love in advocating for a species sometimes considered as second-class citizens.

Caitlin deeply values educating clients to make well-informed decisions on behalf of their companions. She has specific interests in gastrointestinal medicine, toxicology, and trauma cases, and is excited for all of these aspects within emergency medicine. As a lifelong student, she is committed to always expanding her knowledge base with the most recent medical advancements and evidence.

When not working, Caitlin enjoys football season (go bills), exploring the city, and spending time with her cats, Vinci and May, and recently adopted kitten, Barry.

Tianna Chin, VMD

Emergency Doctor

Tianna is originally from New York City, where she attended CUNY Hunter College while contracted with the United States Air Force. After receiving an Honorable Discharge in 2014, her love for people, animals, and medicine led her to the veterinary field where she found her passion. She is a recent 2021 graduate of the University of Pennsylvania School of Veterinary Medicine.

Her experience prior to veterinary school included the Bronx Zoo Veterinary Hospital, research at the Animal Medical Center, the ASPCA Shelter Veterinary Hospital, several animal rescues, and volunteering as a farmhand. During her time at PennVet Tianna was an active member of several clubs and served on her class board as a Student Liaison. Most notable memberships include partaking in the indoctrination and part of the board of a Diversity Council and organizing programs through PetSmart Charities for diversity and inclusion within the veterinary field.

Tianna ultimately decided to join PASE and enter Emergency Medicine after falling in love with the challenge and excitement of emergency medicine during her clinical year. Her other interests include Shelter Medicine and Exotic animal medicine. Her special interests include increasing quality care, no matter the circumstances, and positive experiences for both you and your animals.

On her off days, Tianna enjoys tending to her urban jungle and taking pictures of her rescue rabbit Cupid.

Ellen Manneschmidt, DVM

​​​​​​​Emergency Doctor

Dr. Ellen Manneschmidt was born and raised in eastern Tennessee in the foothills of the Smoky Mountains. She graduated with an AAS and then BS in Veterinary Technology from Lincoln Memorial University in the Cumberland Gap, Tennessee before pursuing her doctorate at the University of Tennessee College of Veterinary Medicine. After graduating, Dr. Manneschmidt moved to Philadelphia where she has worked as both an emergency and general practice veterinarian for the last few years.

She is excited to jump on board with both the PASE and the WAAH teams. She is splitting her time working general practice and emergency care, so you may see her at PASE or at WAAH for your pet's general care needs. Some of her veterinary interests include internal medicine and critical care. She also enjoys connecting with her clients over their special human-animal bond.

In her free time, Dr. Manneschmidt enjoys outdoor activities such as hiking, camping, and gardening or spending time with her dog, Remington and her husband. She also loves spending time exploring creative outlets such as painting and drawing.

Amanda Eldridge, DVM

Emergency Doctor

Dr. Amanda Eldridge is an Emergency Veterinarian at PASE. As a born and raised Philadelphia native, she is very excited to be able to give back to the people and animals of her city!

Amanda is a graduate of Philadelphia Central High School’s 272nd class. After high school, she began her undergraduate education at Penn State, receiving a B.S. in Animal Science. During her time at Penn State, she volunteered at a rehabilitation center for wildlife and exotics, worked at the Penn State Deer Pens, and had internships during the summers at the Philadelphia Zoo and Elmwood Park Zoo.

After graduating from Penn State, she moved to the beautiful island of Saint Kitts and Nevis to attend Ross University School of Veterinary Medicine. There she was able to make her lifelong dream of becoming a veterinarian come true while also getting to experience a new country. During this time, she found an interest in integrative veterinary medicine as a way to expand options for her future patients. Alongside studying for her veterinary education, she became a Certified Veterinary Acupuncturist (CVA) through CHI University. Amanda spent her clinical year of veterinary school at Louisiana State University. There she found a passion for the *pase* and challenge of emergency medicine.

Amanda understands the important role animals play in our lives. She loves to be able to help pet owners do the best for their animals to provide more happy days together with accessible veterinary care. Additionally, she has particular interest in surgery, animal behavior, and working with local rescue groups. When not working, she is typically spending her time outside with her Coconut Retriever fur-child, Tilly. She also loves to travel, cook, and spend time with family and friends

Sarah Rub, VMD

Emergency Doctor

Bio Coming Soon

Kyle Hohu, DVM

Emergency Doctor

Bio Coming Soon

Elise Diffie, DVM

Emergency Doctor

Bio Coming Soon

Stephanie Gordon

Practice Manager

Stephanie Gordon began her career working as a kennel manager while attending the University of the Sciences in Philadelphia. Originally pursuing a doctorate in physical therapy, Stephanie altered her plans realizing her appreciation for the veterinary field. She continued to focus on a degree in biology and a minor in communications. Her passion for managing has lead to her actively pursuing a certification in veterinary practice manager (CVPM). Stephanie has experience working as a technician in general practice, overnight shifts in emergency, and has spent the last 5 years in practice management. When she is not dedicated to the hospital and caring for pets, she enjoys hiking with her rescue dog, Axel, scuba diving, yoga, and numerous amount of outdoor activities.

Rebecca Butterworth

Referral Manager

A University of Delaware graduate, Rebecca has been working as a technician in the veterinary field for fourteen years.

Rebecca launched her career working in General Practice and later moved onto more specific aspects of veterinary practices, including emergency and ophthalmology - both of which she has been involved in for the past four years.

When she’s not working, Rebecca enjoys scuba diving (in open and deep water), baking and cooking, and hanging out with her two rescue pups at home — both of whom she considers to be “her everything”!

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