He was an author, illustrator, playwright and journalist.
He is said to have introduced Whistler to Lady Meux, leading to commissions for her portraits including Arrangement in Black: Lady Meux y228.
He worked paricularly for the The Saturday Review. He is thought to have been the first actor to portray Sherlock Holmes.
Beale, Sally. Brookfield, Charles Hallam Elton (1857–1913). Oxford Dictionary of National Biography, Oxford University Press, 2004, online edition; 'Charles Brookfield', Wikipedia.