Sergey Ulasen first discovered the notorious Stuxnet worm in 2010. He joined the company in August 2011, immediately starting to contribute to the ever growing expertise of our malware analysis team, which now consists of more than 100 experts around the world. The worm was expertly designed and constructed, apart from its causing regular BSODs, since we couldnt detect it with regular detection means. Most probably a rootkit was involved too, and probably a malware infection was involved. We eventually found the malware, and figured out its stealthy nature, spreading its payload.”]
Source: https://eugene.kaspersky.com/2011/11/02/the-man-who-found-stuxnet-sergey-ulasen-in-the-spotlight/