Brian Krebs is an investigative journalist and cybersecurity expert, known for his coverage of cybercrime and computer security issues. He is the founder of KrebsOnSecurity, a website that focuses on in-depth reporting on cybercrime and cyber-security threats. He is also a frequent contributor to other publications such as The New York Times, Wired and The Washington Post.

Krebs began his career as a journalist at The Washington Post in 1995, where he covered technology and crime. He quickly became interested in the intersection of technology and crime, and began to focus on cybercrime. In 2005, he started writing a blog for The Washington Post called "Security Fix," where he reported on cybercrime and computer security issues.

In 2009, Krebs left The Washington Post to start KrebsOnSecurity, his own website, where he could pursue in-depth reporting on cybercrime and cyber-security threats. The site quickly gained a reputation for its in-depth reporting on cybercrime and computer security issues, and Krebs became known as one of the leading journalists covering the field.

Krebs' reporting has had a significant impact on the cybersecurity field, and his investigations have led to the takedown of multiple criminal organizations. His work has also played a role in the arrests and convictions of several cybercriminals.

One of his most notable investigations was the reporting on the Target data breach, where he was the first to report on the scale of the breach and the type of data that was stolen. This led to a chain of reporting that exposed the fact that Target had failed to implement basic security measures that would have prevented the breach.

Krebs also reported on the Mirai botnet, which was used to launch massive DDoS attacks, and the Ghostnet, a massive cyber-espionage network. These investigations led to the shutdown of the botnet and the exposure of the cyber espionage network.

Krebs is also recognized for his coverage of the business of cybercrime, where he has reported on the underground marketplaces and the economy of cybercrime. He has also reported on the ways in which cybercriminals launder money, which has led to the closure of several illegal payment processors.

Krebs has won several awards for his reporting, including the National Press Foundation's Dirksen Award for distinguished reporting of Congress, and the Loeb Award for his coverage of the Target data breach. He is also a fellow at the Center for Advanced Defense Studies, a security think-tank.

In summary, Brian Krebs is an investigative journalist and cybersecurity expert, known for his coverage of cybercrime and computer security issues. He is the founder of KrebsOnSecurity, a website that focuses on in-depth reporting on cybercrime and cyber-security threats. He has had a significant impact on the cybersecurity field, and his investigations have led to the takedown of multiple criminal organizations. He is also recognized for his coverage of the business of cybercrime and has won several awards for his reporting.