He holds academic titles at a number of universities in South East Queensland.

[1][2] Gabbett is known for contributing to discovering the genetic basis of semi-identical (sesquizygotic) twins[3][4][5][6] and defining the clinical features and molecular cause of Temple–Baraitser syndrome.

[7][8][9] Gabbett attended high school at Marist College Ashgrove,[10] where he was awarded the Australian Student Prize[11] and was accepted into the University of Queensland to study medicine.

[12] Gabbett was joint first author on the paper that demonstrated biallelic mutations in the mismatch repair genes are associated with malfomations of the brain.

[8][9] Gabbett and Nick Fisk were able to postulate, with supportive molecular evidence, how semi-identical (sesquizygotic) twinning is the result of a single egg being fertilized by two sperm from the same man.