Another two IT industry figures have been confirmed among those killed in the attack on the World Trade Center on Tuesday.
James Hayden, chief financial officer at ecommerce software company Netegrity, was on United Airlines Flight 175, the second plane to hit the Center. Hayden, 47, leaves a wife and two children.
Netegrity chairman and chief executive officer Barry Bycoff said: "I speak on behalf of the entire company in conveying our deepest sadness at the tragic loss of an incredible human being and friend. Our sympathies are with his family and friends during this very difficult time."
Phil Rosenzweig, a software organisation director with Sun Microsystems, was among those killed on American Airlines flight 11, the first plane to crash. Sun said that all 340 of its workers based on floors 25 and 26 of the Center made it out safely.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago