Alexander Junior Grant (born 27 August 1983), professionally known as Alex da Kid or by.ALEXANDER, is a British musician, record producer, songwriter, record executive and fashion designer from Wood Green, London. He has gained recognition for producing several hit singles for artists of multiple music genres (mostly hip hop and alternative rock), such as Dr. Dre ("I Need a Doctor"), Nicki Minaj ("Massive Attack"), B.o.B ("Airplanes" featuring Hayley Williams), Eminem ("Love the Way You Lie" featuring Rihanna), Diddy ("Coming Home" with Dirty Money featuring Skylar Grey), Imagine Dragons ("Radioactive") and Cheryl ("Under The Sun").
Although he now lives in Los Angeles, the Evening Standard named him one of "London's Most Influential People in 2011." He has been nominated for numerous Grammy Awards including "Album of the Year" for his work on Rihanna's Loud. His record label, KIDinaKORNER, is a subdivision of Interscope Records. In both 2013 and 2014, Grant (as owner of KIDinaKORNER Records) was chosen by Billboard Magazine for their "Top 40 Under 40." In 2020, Grant released a jazz album titled 000 CHANNEL BLACK, under the pseudonym by.ALEXANDER.