John H. Robinson was born in Ireland and immigrated to Boston, Massachusetts.

Robinson enlisted in the U.S. Army and served as a private in Company I, 19th Massachusetts Volunteer Infantry. His regiment was on the line during the Battle of Gettysburg, Pennsylvania. On the third day of the battle (July 3, 1863), his regiment repulsed elements of Pickett’s Charge.

Robinson’s Medal of Honor citation read: "The President of the United States of America, in the name of Congress, takes pleasure in presenting the Medal of Honor to Private John H. Robinson, United States Army, for extraordinary heroism on 3 July 1863 at Gettysburg, for capture of flag of 57th Virginia Infantry (C.S.A.)."

Robinson received his Medal of Honor on December 1, 1864.

John H. Robinson died in Boston on November 30, 1883 and was buried in Mount Benedict Cemetery, West Roxbury, Suffolk County, Massachusetts.

References:
Congressional Medal of Honor Society
Hall of Valor Project
Multiple Wikipedia searches.