Brett King specializes in inflammatory skin diseases – in particular alopecia areata, vitiligo and atopic dermatitis – as well as hair loss disorders. He pioneered the use of Janus kinase (JAK) inhibitors in dermatology, and his work has revealed the broad utility of JAK inhibitors for the treatment of alopecia areata, vitiligo, atopic dermatitis, granulomatous diseases, as well as other conditions.