Eamonn Roderique Walker (born 12 June 1962) is a British film, television and theatre actor. In the United States he is known for playing Kareem Saïd in the HBO television series Oz, for which he won a CableACE Award, as Winston in In Sickness and in Health, and John Othello in the 2001 ITV1 production of Othello. Since 2012 he has played Firehouse 51 Battalion Chief Wallace Boden on Chicago Fire and other shows within the Chicago franchise.