Dr. Johnson was raised in the Midwest. In 1977, he graduated with a B.S. degree in Microbiology from Michigan State University. Dr. Johnson received his Doctorate in Veterinary Medicine from Michigan State University, graduating with honors, in 1981. That same year, he moved to the Merrimack Valley and practiced Veterinary Medicine at the Andover Animal Hospital from 1981 to 1993. He then left to join the Plaistow Animal Medical Center until 1995. Prior to joining Bulger Veterinary Hospital, Dr. Johnson owned a clinic, the Johnson Veterinary Hospital, which had been located in Lawrence since 1995.
Dr. Johnson lives in Pelham, N.H. with his two Rottweilers, Atlas and Ullr, his Miniature Pinscher named Max and his eight cats.