Kenneth Scott Hannan (born January, 23rd, 1979) was selected in the first round of the 1997 NHL Entry Draft, 23rd overall, by the San Jose Sharks from the Kelowna Rockets of the Western Hockey League (WHL). He made his professional debut at the start of the 1998-99 season with the Sharks. Hannan then split the 1999-2000 season, his first full professional season, with the Sharks and their American Hockey League (AHL) affiliate Kentucky.

Hannan became a mainstay on the Sharks’ defense corps from the 2000-01 season and evolved as an effective, gritty, shut-down defenseman; earning a selection to the 54th NHL All-Star Game for the Western Conference in the 2003-04 Season. Hannan emerged as a premier defenseman during the 2004 Stanley Cup playoffs. On July 1, 2007, Hannan signed a four-year, multi-million dollar contract with Colorado Avalanche.

On November 30, 2010, Hannan was traded from Colorado to the Washington Capitals in exchange for Tomas Fleischmann.

On August 13, 2011, the Calgary Flames signed Hannan as a free agent to a one-year contract.

On August 17th, 2012, the Nashville Predators signed Hannan as a free agent to a one-year contract.

On April 3, 2013, Hannan returned to the San Jose Sharks via trade in exchange for a conditional seventh-round pick in 2013. Hannan became an unrestricted free agent after the seasons end, and on July 5, 2013, re-signed with the Sharks on a one-year deal. He played his 1,000th career NHL game on October 14, 2014, against the Washington Capitals.

Hannan announced his retirement on February 24, 2016, after 16 seasons in the NHL.

Hannan and wife Kristina have two sons, Gage and Owen and reside in San Jose, California USA.