The AVMA, which turns 150 this month, had several homes before landing in Schaumburg, Ill. In 1863, the organization launched in New York, then moved to Detroit and soon after Chicago before settling in Schaumburg in 1975. In 1991, the AVMA moved into its current five-story headquarters. AVMA's membership has grown from 1,650 to 84,000 over the past century, and the field has grown increasingly complex, said President Dr. Doug Aspros. "One hundred and fifty years ago, veterinarians were just horse doctors because that was the business," Dr. Aspros said. One thing that hasn't changed, he said, is the group's purpose: "To ensure animal and human health and advance the veterinary profession."