John Irvin Gregg

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John Irvin Gregg was a career U.S. Army officer. He fought in the Mexican-American War and during the American Civil War as a general officer in the Union army.

John Irvin Gregg was born in Bellefonte, Pennsylvania, the grandson of Andrew Gregg and a cousin of future Union general David McMurtrie Gregg.

He was also related to Pennsylvania governor Andrew Gregg Curtin.

Gregg served in the "Centre Guards," a Centre County militia unit, as a lieutenant.

During the Mexican-American War, he enlisted as a private in the 2nd Pennsylvania Infantry on December 29, 1846, and was mustered out of the volunteer service on May 6, 1847.

He then received promotions to first lieutenant as of February 18, and to captain as of September 5, both in the 11th U.S.

Infantry, serving as a recruiting officer. He was honorably discharged on August 14, 1848. He then entered the iron industry with the firm Irvin, Gregg & Co., owned by family members