Also known for his longtime collaboration with playwright August Wilson, Gallo designed the Broadway premieres of all his later works, including Jitney, King Hedley II, Gem of the Ocean, Radio Golf, and the revival of Ma Rainey's Black Bottom.
Gallo was honored to design the Kennedy Center's tribute production of August Wilson’s Twentieth Century.
Outside of the US, Gallo was a frequent collaborator with Netherlands-based Joop van den Ende's Stage Entertainment and has served as his designer for productions throughout dozens of cities within the European Union including Amsterdam, Antwerp, Vienna, Hamburg, Oberhausen, Berlin, Stuttgart, Rome, Milan, Madrid, Moscow, Barcelona, and many more.
Asian ventures include the immersive Peter Pan-themed Neverland in a 50,000 square foot venue in Beijing and the original musical, Tears of Heaven, in Seoul.
In 2013, Gallo re-created the band's original tour truck and customized a flatbed-turned-stage where Phish performed "in the round" in the world's most famous arena.
In 2017, he filled the Garden with "an ocean of light and love" with performing riggers operating a rotating mast of sails amid an audience twinkling with LED wristbands.