Mark Houser is an author, professional speaker, and award-winning journalist who shares the amazing and inspirational stories of America's first skyscrapers and the dreamers who brought them into being. His books include MultiStories: 55 Antique Skyscrapers & the Business Tycoons Who Built Them and Highrises Art Deco: 100 Spectacular Skyscrapers from the Roaring '20s to the Great Depression, , with digital artist Chris Hytha. Thousands of people have taken his Antique Skyscrapers Rooftop Views guided tours in Pittsburgh.