Chip Kelly's recently-announced coaching staff offers a well-rounded group of football minds with a vast knowledge to share with the San Francisco 49ers.
After digging through each coach's biography, here's a look at some of the connections and numbers that stood out from the current 17-man coaching staff.
2 – The number of coaches who have played in the NFL (RB coach Tom Rathman, ILB coach Hardy Nickerson.
4 – The number of coaches on the staff who have worked with Kelly in the past: QB coach Ryan Day (Eagles), WR Coach Bob Bicknell (Eagles), DL coach Jerry Azzinaro (Ducks, Eagles), special teams assistant Michael Clay (Ducks, Eagles).
4 – The number of BCS game appearances made by Kelly with Azzinaro on his Oregon staff from 2009-12 (Rose Bowl, BCS Championship, Rose Bowl, Fiesta Bowl).
11 – The number of coaches who will be working with Kelly for the first time.
12 – The number of coaches who played football collegiately, including Kelly (quarterback and defensive back at the University of New Hampshire from 1981-84).
14 – The number of coaches who have experience on the professional and collegiate levels.
16 – Every assistant on Kelly's staff was employed by an NFL team last season.
25– The age of the youngest coach on staff, Michael Clay, the team's special teams assistant.
42 and 46 – The Super Bowls won by Pat Flaherty, who is the only coach on Kelly's staff with Super Bowl wins as a coach. Rathman won two as a player with the 49ers. Flaherty was the offensive line coach for the New York Giants for the past 12 seasons.
47 – The uniform number of California linebacker Hardy Nickerson Jr., who is the son of the 49ers inside linebacker coach. Nickerson Jr. also played for his father at Oakland's Bishop O'Dowd High School from 2010-13.
73 – The number of receptions Tom Rathman totaled in 1989, which was the most catches by any NFL running back that season.
127 – Years of combined experience on the collegiate/professional level combined on Kelly's staff.
1,586– The number of tackles totaled by 49ers linebackers coach Hardy Nickerson who played for four different NFL teams from 1987-2002 (Pittsburgh Steelers (1987-92), Tampa Bay Buccaneers (1993-99), Jacksonville Jaguars (2000-01), Green Bay Packers (2002)). Hardy, a fifth-round pick who was a five-time Pro Bowl selection, also recorded 21 sacks and 12 interceptions in 16 seasons.
2001 – The year when Day played for Kelly when the head coach was still an offensive coordinator at New Hampshire. As a starting quarterback, Day set four UNH passing records, including best completion percentage and touchdown passes in a career.
2012 – The last year of Modkins' three-year tenure as offensive coordinator for the Buffalo Bills. The AFC club ranked fourth in rushing average (5.0) and sixth in rushing yards (2,217) in the entire league.
2012 – The year when Clay was a second-team linebacker for Kelly's Oregon team which beat Kansas State, 35-17, in the Fiesta Bowl.
2013 – The year when Hafley served as Tampa Bay's secondary coach/safeties with Nickerson on the same staff (linebackers coach).