Machen Vs. Fundamentalists, Modernists, and Moderates

Celebrating 100 years since the publication of Christianity - Liberalism by J. Gresham Machen -1881-1937-. Machen was known as a leading voice for the Fundamentalists in the Fundamentalist- Modernist Controversy in the 1920's - 30's, but was he a Fundamentalist himself-- Or was he a Calvinist Presbyterian--