John Weldon, known by his pen- and stage-name Brinsley MacNamara, was an Irish writer, playwright, and the registrar of the National Gallery of Ireland. He is the author of several novels, the most well-known of which was his first, The Valley of the Squinting Windows (1918). His acting career with the Abbey Theatre began in September 1910 with a role in R. J. Ryan's The Casting-out of Martin Whelan.