Howard Yost is an arrogant architect who designed the Crystal Spire in London as the world's tallest building, taller than the skyscrapers of Dubai. On night of the official opening ceremony of the Crystal Spire, Yost ordered not only for the electro-magnetic ramps to be activated, lifting the skyscraper to its tallest possible point but also for all of the skyscraper's lights to be switched on, which seriously concerned the London fire chief Cass McCready. However, the over-power outage of the electricity caused Crystal Spire to catch fire.
Yost was ordered by McCready not to activate the building's in-built extinguishers until she and her team of firefighters rescued the people trapped at the top of the building. However, Yost was more concerned about his building than the people trapped inside. However, when International Rescue had to come to assist McCready and her team, Virgil and Alan suggested to cut off the top of the building in order to save the people, much to Yost's outrage when he realised that he no longer had the world's tallest building.
Voiced by Ake Kotabe, Howard Yost appears in Inferno.