He was the son of John Baker of Presteigne.
He was appointed High Sheriff of Radnorshire for 1540–1541 and elected a Member (MP) of the Parliament of England for Radnorshire in 1542. He also served as a deputy lieutenant and custos rotulorum for the county.
He married Catherine, the daughter of John Bradshaw of Ludlow, Shropshire and had at least 1 son.
- "BAKER, John IV (by 1503-44), of Presteigne, Rad". History of Parliament Online. Retrieved 1 July 2013.