He completed Internal medicine training at McGill University and a Respiratory Medicine Fellowship at UBC. He received postdoctoral training in Tuberculosis research at British Columbia Centre for Disease Control, and has a Master’s in Public Health from Harvard School of Public Health. His clinical interests include treatment of tuberculosis and nontuberculous mycobacterial disease. His tuberculosis research focus includes foreign-born risk factors for tuberculosis disease and the role of whole genome sequencing in understanding tuberculosis transmission dynamics. He received the Michael Smith Scholarship in 2014. Dr. Johnston has been a member of the Union’s NAR abstract committee for the past two years, and has been an abstract chair and session moderator for the Union’s international meeting.