Joseph Baker Jr. (1740-1816) was born in Pembroke, New Hampshire, and died in Bow, New Hampshire. He married Mary Ann M. Baker (b. Moore) around 1762 and they settled in Bow. Baker was active in his local church, served as a selectman, and collected provincial revenues. He was a soldier during the American Revolutionary War and was stationed at Fort Washington in Portsmouth, New Hampshire, in June 1799. Baker was the paternal grandfather of Mary Baker Eddy, although he passed away before she was born. Eddy's father, Mark Baker, along with her uncle James Baker, inherited a 500-acre farm in Bow and Concord, New Hampshire, from Joseph, including the two-story farmhouse Joseph had built where Eddy was later born.

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