Early years

Greisen was born and raised in Sturgeon Bay, Wisconsin.

College career

Greisen played college football at Wisconsin. He finished his career with 337 tackles, 11 sacks and five interceptions. As a senior he started every single game and finished with a career-high 167 tackles. This earned him All-Big Ten Conference first-team honors. He majored in agricultural business.

Professional career

New York Giants

Greisen was originally a fifth round (152nd pick overall) draft choice by the New York Giants of the NFL in the 2002 NFL Draft, as a linebacker out of the University of Wisconsin-Madison. Adept at both weakside and middle linebacker, Greisen has been a spot starter, special teamer, and consistent backup. He made over 75 tackles in both the 2004 and 2005 campaigns, and has forced four sacks and five fumbles to date.

Jacksonville Jaguars

Greisen was signed by the Jacksonville Jaguars on April 28, 2006 and played one season with the team posting 82 tackles and his first career interception on September 10 versus the Dallas Cowboys. He was released in September 2007.

Baltimore Ravens

On September 19, 2007, Greisen signed with the Ravens. On March 13, 2008 the Ravens re-signed him to a three-year, $4 million contract. The deal includes a $1 million signing bonus. On July 1, 2008, he was the youngest player to receive a vote from ESPN.COM's coach's poll for the smartest players. At 28, Greisen (one vote) joined teammates Ed Reed (three votes) and Ray Lewis (second place with four votes) on the list, which was led by Zach Thomas (six votes).

Greisen was released by the Ravens on March 12, 2009, saving the team $400,000 in salary cap space.

Denver Broncos

On April 28, 2009, Greisen signed a one-year contract with the Denver Broncos. He was placed on season-ending injured reserve with a knee injury on August 4.

He was released on August 12, 2010.

Omaha Nighthawks

Greisen was signed by the Omaha Nighthawks of the United Football League on September 8, 2010.

[ Source: Wikipedia ]