The Seattle Seahawks have reportedly chosen former Baltimore Ravens defensive coordinator Mike Macdonald to replace long-serving head coach Pete Carroll, becoming the youngest head coach in the NFL in the process. Macdonald has worked closely with the Ravens for the past nine years, including the last two as defensive coordinator, during which time Baltimore boasted the best scoring defense in the NFL. The 36-year-old's appointment has also seen him usurp New England Patriots coach Jerod Mayo as the youngest coach in the league. While Macdonald's appointment marks a significant shift in culture for the Seahawks franchise, he faces the unenviable task of trying to replicate Carroll's success.