He studied at West London School of Art and gained numerous prizes for drawing.
Pearse designed posters campaigning for women"s suffrage. He drew a weekly cartoon for Votes for Women from 1909, and was also regularly published in The Illustrated London News, Boy"s Own Paper and Punch. With Laurence Housman, he set up the Suffrage Atelier.
Pearse produced various artworks, cartoons and propaganda related to British efforts in World War One.
He was a wood engraver, book illustrator and art critic, including for the Manchester Guardian.