Sophia Yin

Sophia Yin (February 5, 1966 – September 28, 2014 in Davis, California) was a veterinarian, applied animal behaviorist, author and lecturer. She was a pioneer in the use of positive reinforcement for training dogs, and was widely recognized as an expert in the training of pets.
Education and career.
Yin graduated from University of California, Davis (UC Davis) in 1993 with a Doctor of Veterinary Medicine (DVM). After graduation, she worked in private practice, where she realized that more pets were euthanized due to behavioral problems than medical issues. This inspired Yin to return to university to study animal behavior, and in 2001, she returned to UC Davis to obtain her Master's in Animal Science under the supervision of Dr. Edward Price, completing her thesis on vocal communication in dogs. After obtaining her master's degree, Yin remained at UC Davis for five years, lecturing and supervising student research projects. 
From 2007–2008, Yin was president of the American Veterinary Society of Animal Behavior. She also served on the American Association of Feline Practitioners (AAFP) Handling Guidelines Committee. She lectured around the world to veterinarians and animal professionals, teaching seminars and workshops on animal behavior and low stress handling for dogs and cats.
Her behavior modification programs are based on the science of learning. She focused on the use of desensitization combined with classical and operant conditioning. Her approach stressed the combination of positive reinforcement, negative punishment (reward desired behaviors, remove rewards for unwanted behaviors) as well as the need to observe animals closely and be aware of how the trainer's body language and movement affect the animal's response. 
Yin invented "Treat & Train", a remote controlled, reward based training system based on positive reinforcement. 
Writing and media.
Yin's first book was "The Small Animal Veterinary Nerdbook", which she initially compiled while an undergraduate. The first edition of the "Nerdbook", published in 2000, sold 4,500 copies. After the third edition had been published, it sold move than 40,000 copies.
In 1999, Yin began writing a column for the "San Francisco Chronicle", which appeared every two weeks. Yin appeared on the Animal Planet television shows "Dogs 101" and "Weird, True & Freaky" in 2008.
Yin created many YouTube videos to help pet owners with handle their animals' behavioral problems, and to promote stress-free handling techniques to veterinary professionals. She also produced educational booklets and posters to educate veterinary staff, dog trainers, other pet professionals and pet owners on how to interact in positive ways with their dogs and cats. In 2010, Yin was included in Bark Magazine's "100 Best and Brightest in the World of Dogs", which praised her ability to impart knowledge to fellow professionals and members of the public. 
Other books authored by Yin include "Low Stress Handling, Restraint and Behavior Modification of Dogs & Cats", and "How to Behave So Your Dog Behaves and Perfect Puppy in 7 Days". Her DVDs include "Creating a Pet-Friendly Hospital, Animal Shelter or Petcare Business"; "Towel Wrap Techniques for Handling Cats with Skill and Ease"; and "Creating the Perfect Puppy". Yin also had her own publishing company, Cattle Dog Publishing.
Death.
Yin died September 28, 2014, of suicide at her Davis home. She was 48. 