Who painted Dorian Gray's portrait in 'The Picture of Dorian Gray'?

Who painted Dorian Gray's portrait in The Picture of Dorian Gray? Basil Hallward did. He is an artist and Dorian's friend, and the painting is described as his masterpiece.

Basil's admiration for Dorian's beauty makes the portrait unusually personal. After Dorian meets Lord Henry Wotton and adopts his hedonistic philosophy, he wishes that the portrait would age and bear the consequences of his actions instead of him. The supernatural wish comes true: Dorian remains youthful while the painting becomes increasingly corrupted.

A common mix-up is Lord Henry Wotton, who influences Dorian but does not paint the picture. Sibyl Vane is an actress whose tragic relationship with Dorian affects the portrait's appearance, while Alan Campbell is a scientist later blackmailed into disposing of Basil's body. Oscar Wilde first published the story as a novella in 1890 and expanded it into the 1891 novel.