Francis P. Church

He was born in Rochester, New York and graduated from Columbia College of Columbia University in New York City in 1859.

With his brother William Conant Church he established The Army and Navy Journal in 1863, and Galaxy magazine in 1866 (merged with Atlantic Monthly after 10 years[1]). He was a lead editorial writer on his brother's newspaper, the New York Sun, and it was in that capacity that in 1897 he wrote his most famous editorial, Yes, Virginia, there is a Santa Claus. In this editorial he responds to a young girl's question if there truly is a Santa Claus, writing that he definitely exists and placing himself within Christmas' history forever.[neutrality is disputed]

Church died in New York City, aged 67, and was buried in Sleepy Hollow Cemetery in Sleepy Hollow, New York. He had no children.

Source: Wikipedia