The Zeitgeist List · coordinators · never a head coach
David Duggan.
Defensive coordinator · 5 seasons · 3 stints · 3 programs0 seasons ranked in the national top 10%
Own effect on the unit
Defense−0.17#349 of 458 · less than most
The tenure clock
Every stop re-aligned to its own first year, so the stops stack instead of scrolling past each other. The gray dashed line is a reference, not a path: each point is the median of whoever was still in the job that year, across every real OC/DC stint since 2014 at that role, and the pool shrinks year over year because surviving to a later year means not having been fired.
Southern Miss 2014–2015
Arkansas State 2019–2020
Kent State 2023–2023
Median of those still in the job, that year of a tenure. A shrinking pool, not a path.
Southern Miss, 2 years
+36.7
41.0 to 77.7 percentile.
Arkansas State, 2 years
−14.8
38.8 to 24.0 percentile.
Median defensive coordinator
+1.0
first season to last, across 239 stints of 3+ years. 52.3% improve at all.
Every stop on the calendar
| Years | Program | Walked into | Year 1 | Best | Vs. talent |
|---|---|---|---|---|---|
| 2014–2015 | Southern Miss | no record | 41.0 | 77.7 | +29.7 |
| 2019–2020 | Arkansas State | 76.5 | 38.8 | 38.8 | −12.1 |
| 2023–2023 | Kent State | 31.7 | 5.6 | 5.6 | −32.2 |
No prior-season record for the first stop (Southern Miss, 2014) — the data floor starts there.
Arkansas State 2019–2020: ranked 77th the year before he arrived, 39th at its best — went backwards.
Kent State 2023–2023: ranked 32nd the year before he arrived, 6th at its best — went backwards.