Short answers, pulled from the story.
Henri Felix Emmanuel Philippoteaux was a French painter and illustrator born in Paris on the 3rd of April 1815 and died there on the 8th of November 1884. He was known primarily as a battle painter and was awarded the Legion d'honneur in 1846. He trained under Leon Cogniet and first exhibited at the Paris Salon of 1833.
The Gettysburg cyclorama is a large panoramic painting of the Battle of Gettysburg, painted in 1882-83 by Henri Philippoteaux and his son Paul Philippoteaux. Within a year of its debut, half a million people had stood before it. It is credited with reviving public interest in the cyclorama medium for another decade.
A cyclorama is a large panoramic painting on the inside of a cylindrical platform, designed so a viewer standing at the center sees a 360-degree image. The Philippoteaux father-and-son team enhanced the effect by adding physical diorama elements and real battlefield objects that blended into the painted canvas.
Henri Philippoteaux produced a portrait of Napoleon in his regimental uniform and a group of paintings depicting French victories in the Napoleonic Wars. His catalogue also includes The Retreat from Moscow, painted in 1835, and Colonel Ponsonby rescued at Waterloo by a French officer.
Henri and Paul Philippoteaux collaborated on The Defence of the Fort d'Issy in 1871, a cyclorama depicting events of the Franco-Prussian War. They also jointly created the celebrated Gettysburg cyclorama, painted in 1882-83, which drew half a million visitors within its first year.
Henri Philippoteaux died on the 8th of November 1884 in Paris. His obituary appeared in the New York Times on the 10th of November 1884, two days after his death.