Dr. Stephen A. Mackenzie was a deputy sheriff for more than 20 years and trained and handled police service dogs for more than 30 years. A popular seminar instructor, he testified in both criminal and civil cases as a court-recognized expert in animal behavior. He was an integral part of the International Police K9 Conference, where he worked with thousands of police K9 teams over the years, and was a professor of animal science at the State University of New York at Cobleskill. Stephen passed away on March 22, 2021. Robert S. Eden is a retired 28 year police veteran. Working with the Delta Police Department in British Columbia, Canada, Robert became a member of the dog section in 1983 and was appointed to the B.C. Police Commission's committee to create minimum police dog training standards for law enforcement agencies in the province. In 1991 he created and developed the International Police K9 Conference, a training seminar that was neither politically oriented nor specific to any particular style of training. Robert continues to consult worldwide on police K9 operations.