Marcus L. Greenfield

About the Author

Marcus L. Greenfield is a dedicated canine behaviorist and author with over two decades of experience in dog training and animal welfare. Growing up on a family farm in rural Ohio, he developed a profound passion for animals, particularly the American Bully breed, which inspired his lifelong commitment to responsible pet ownership. Greenfield's expertise stems from hands-on work with breeders, shelters, and families, where he has helped countless dogs overcome behavioral challenges and thrive. In his acclaimed book, AMERICAN BULLY DOG TRAINING: A Complete Guide to Raising a Happy, Well-Behaved Puppy to Adulthood: Training, Socialization, Feeding, Care, and Grooming, he shares practical, science-backed advice to empower new owners. A sought-after speaker at pet expos and a contributor to veterinary journals, Greenfield continues to advocate for humane training methods that strengthen the human-canine bond.