Dennis Fong (), better known by his online alias Thresh, is an American businessman and retired professional player of the first-person shooter video games Quake and Doom. He is a co-founder of Xfire, an instant messenger and social networking site for gamers, which was acquired by Viacom for 102 million in April 2006. He also co-founded Lithium Technologies, a social customer relationship management (CRM) company. In his playing career his highest profile victory came in 1997 at the Red Annihilation Quake tournament, where he placed first and won id Software CEO John D. Carmack's Ferrari 328. Fong is recognized by the Guinness World Records as the first professional gamer. Playing career Fong began playing Doom at the age of 16 in 1993. He first chose the pseudonym Threshold of Pain, which referred to the ability to withstand enemy fire and suffering. However, as many games had an eight-character ID limit, he went with "Thresh" and liked the word's meaning of "to strike repeatedly". Fong attended the Microsoft-sponsored Doom tournament Judgment Day 1995 in Seattle and defeated Ted "Merlock" Peterson to finish first among 24 competitors from across the US and United Kingdom. The highlight of his gaming career was at the Red Annihilation tournament in 1997. He and Tom "Entropy" Kimzey emerged from a crowded field to face off in the Quake level E1M2 "Castle of the Damned", where Thresh defeated Entropy 14 to -1. At the peak of his gaming career in the middle to late 1990s, he earned approximately $100,000 a year from prize money and endorsements. He retired in 1997 to focus on his business ventures. On July 27, 2016, Thresh was the second person to be inducted into the ESL Hall of Fame. Fong has also been featured in Rolling Stone for his gaming prowess. Business ventures Fong and his brother Lyle started GX Media, the parent company of Gamers.com, FiringSquad, and Lithium Technologies. Fong was the CEO of the company and Lyle was the chief technical officer. The company grew to 100 employees. In 1999, GX Media raised over US$11 million from CMGI and built gamers.com, a popular web portal. Fong's Ferrari was parked in the lobby of the GX Media offices. In 2001, gamers.com was acquired by Ziff-Davis. While running GX Media, Fong was also editor-in-chief at the video gaming site FiringSquad, wrote a monthly column in the popular PC Gamer magazine and co-authored