Brad specialises in Cataract Surgery, Adult Strabismus surgery and general Ophthalmology.

He completed his medical degrees at the University of Queensland (1985), with clinical placements in the United Kingdom. His residency training was at the Royal Brisbane Hospital and Greenslopes Repatriation Hospital.  Prior to his ophthalmology training, he undertook two years of clinical research examining the role of corneal stem cells.

He was appointed to the Queensland ophthalmology training program in 1991, and went on to complete Senior Registrar training on the Western England ophthalmology training program in 1994/95.

Brad has been in private practice in Brisbane since 1995 and has been a Visiting Ophthalmologist at the Royal Brisbane Hospital since 2001.

Dr Horsburgh served as the President of the Australian Society of Ophthalmologists (ASO), during the cataract dispute in 2009. 

In November 2014, Dr Horsburgh was appointed President of Royal Australian and New Zealand College of Ophthalmologists (RANZCO).

Before his appointment as President, Brad held various roles in the college including Secretary, Treasurer and Chair of the Queensland Branch, Federal Council member since 2006, and Federal Board member since 2010, serving three years as Treasurer and two years as Vice President. 

Brad is a previous chairman and medical director of the Queensland Eye Hospital, and is a member of the American Society of Cataract and Refractive Surgery.