Isaac G. Gordon was born on December 22, 1819, in Lewisburg, Pennsylvania.
Gordon was of Scottish descent and worked as a moulder until pursuing classical studies at Lewisburg Academy and studying law under James F. Linn.
After studying law for two years, starting in 1841, Gordon was admitted to the Union County bar in April 1843.
[1] Gordon became a member of the Pennsylvania General Assembly in 1860, representing Jefferson, Clearfield, Elk and McKean counties.
Before his election to the Pennsylvania Supreme Court, Gordon was appointed President Judge of Mercer and Venango counties.