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Sailor · 2015–2026

Jacob Posner

harvard university 420College fleet racingHandicap

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Events
80

869 races · 251 race wins

Win rate
31%

31% win rate · 25 of 80

Podium rate
56%

45 top-three finishes

Typically beats
85%

of boats faced (range 84%–86%, 3,049 boats)

Best class ranking
#5

Helm in 420 · rating 831

Longest win streak
23

race wins in a row

Most successful partnership
Mitchell Callahan

12 wins · 14 podiums in 15 events together · 80% win rate

Best trio
Justin Callahan & Mitchell Callahan

12 wins · 14 podiums in 15 events, all three aboard

Biggest lift
Mitchell Callahan

+20 points of fleet beaten when sailing together

Longest-running crew
Levi Bailey

Jun 2022 – Aug 2023 · 11 events

Nemesis
Reade Decker

33–77 head to head in 111 races

Rival
Blake Behrens

105–108 in 215 races

Best day
25 Oct 2025

2-1-1-2-3-1-2-2-5-10-5-9-8-5-1-11-1-1-9-2-2-1-13-3-14-9-2-2 · 84th Professor Erwin Schell Trophy

Signature result
1st of 60

2023 USA Junior Olympic Sailing Festival · 420 · 1 Dec 2023

Partnerships · 42 sailors

Most successful partnership: Mitchell Callahan — 12 wins · 14 podiums in 15 events together · 80% win rate
  • Rosella Irfan · Harvard University (Crimson) · College fleet racing, College team racing 16events 11 wins together · 14 podiums · 69% win rate · 145 of 296 races won Beat 95% of the fleet together(+18 vs. without) · best 1st · Sep 2025 – May 2026
  • Mitchell Callahan · Harvard University (Crimson) · College fleet racing, College team racing 15events 12 wins together · 14 podiums · 80% win rate · 160 of 289 races won Beat 97% of the fleet together(+20 vs. without) · best 1st · Sep 2025 – May 2026
  • Justin Callahan · Harvard University (Crimson) · College fleet racing, College team racing 15events 12 wins together · 14 podiums · 80% win rate · 160 of 289 races won Beat 97% of the fleet together(+20 vs. without) · best 1st · Sep 2025 – May 2026
  • Levi Bailey · _, Area L, Jacob Posner · 420, Handicap, RS21 11events 3 wins together · 5 podiums · 27% win rate · 24 of 109 races won Beat 88% of the fleet together(+8 vs. without) · best 1st · Jun 2022 – Aug 2023
  • Amelie Zucker · Harvard University (Crimson) · College fleet racing 10events 1 wins together · 3 podiums · 10% win rate · 20 of 192 races won Beat 71% of the fleet together(−11 vs. without) · best 1st · Sep 2025 – Oct 2026
  • Christina Chen · Harvard University (Crimson) · College fleet racing, College team racing 10events 8 wins together · 9 podiums · 80% win rate · 138 of 175 races won Beat 94% of the fleet together(+15 vs. without) · best 1st · Sep 2025 – Oct 2026
  • Robby Meek · Harvard University (Crimson) · College fleet racing, College team racing 9events 6 wins together · 8 podiums · 67% win rate · 123 of 157 races won Beat 96% of the fleet together(+17 vs. without) · best 1st · Sep 2025 – Apr 2026
  • Harrison Strom · Harvard University (Crimson) · College fleet racing, College team racing 8events 3 wins together · 4 podiums · 38% win rate · 45 of 147 races won Beat 79% of the fleet together(−1 vs. without) · best 1st · Sep 2025 – Oct 2026
  • Aidan Pesce · Harvard University (Crimson) · College fleet racing, College keelboat, College team racing 8events 6 wins together · 8 podiums · 75% win rate · 97 of 134 races won Beat 98% of the fleet together(+19 vs. without) · best 1st · Oct 2025 – Apr 2026
  • Ryan Hoffman · Jacob Posner · 420, Handicap 5events 1 wins together · 3 podiums · 20% win rate · 2 of 36 races won Beat 83% of the fleet together(+2 vs. without) · best 1st · Mar 2023 – Feb 2024

Lift shows how much better this sailor finishes with that partner aboard.

Rating history

-9387782201620182020202220242026Helm rating, full-size sailingCrew rating, full-size sailing

— Helm rating, full-size sailing · - - Crew rating, full-size sailing

Event history · 80

DateEventBoatClassRoleFinish
24 Oct 2026Open Atlantic Coast ChampionshipHarvard University (Crimson)College fleet racingB Skipper11th / 18
17 Oct 2026The 35th Captain Hurst BowlHarvard University (Crimson)College fleet racingA Skipper8th / 18
10 Oct 2026Open Atlantic Coast Championships Round 1AHarvard University (Crimson)College fleet racingB Skipper (1-10)7th / 17
3 Oct 2026Danmark TrophyHarvard University (Crimson)College fleet racingB Skipper4th / 19
12 Sep 2026Harry H. Anderson Jr. TrophyHarvard University (Crimson)College fleet racingB Skipper2nd / 17
21 Aug 2026USA Grand Slam – Detroit Cup 2026Josh HydeMatch racingCrew4th / 2
23 Jun 2026Youth Match Racing World Championship 2026Morgan PinckneyMatch racingCrew1st / 2
6 Jun 20262026 Naples Sabot Senior Class ChampionshipJacob PosnerNaples SabotSkipper1st / 9
21 May 2026Open Fleet Race National ChampionshipsHarvard University (Crimson)College fleet racingA Crew7th / 18
19 May 2026Open Eastern National SemisHarvard University (Crimson)College fleet racingA Crew1st / 18
23 Apr 2026ICSA Open Team Race National ChampionshipHarvard University (Crimson)College team racingCrew1st / 16
18 Apr 2026NEISA Open FR Champs - Coast Guard Alumni BowlHarvard University (Crimson)College fleet racingA Crew1st / 18
11 Apr 2026Thompson TrophyHarvard University (Crimson)College team racingSkipper2nd / 16
4 Apr 2026NEISA Open Team Race Championship/Fowle TrophyHarvard University (Crimson)College team racingCrew1st / 12
28 Mar 2026The Lynn Marchiando Trophy Team Race-2026Harvard University (Crimson)College team racingSkipper1st / 16
21 Mar 2026The Friis TrophyHarvard University (Crimson)College team racingSkipper1st / 9
14 Mar 2026Graham Hall Team RaceHarvard University (Crimson)College team racingCrew1st / 16
7 Mar 2026The Wood TrophyHarvard University (Crimson)College team racingCrew1st / 7
28 Feb 2026Liam O'Keefe '26 Trophy Team RaceHarvard University (Crimson)College team racingSkipper1st / 8
14 Feb 20262026 Southern Collegiate Offshore Regatta (J105)Harvard University (Crimson)College keelboatA Crew2nd / 12
25 Oct 202584th Professor Erwin Schell TrophyHarvard University (Crimson)College fleet racingA Crew1st / 18
18 Oct 2025Open Atlantic Coast Championship FinalsHarvard University (Crimson)College fleet racingA Crew (1-10)1st / 18
11 Oct 2025The 34th Captain Hurst BowlHarvard University (Crimson)College fleet racingB Skipper7th / 14
4 Oct 2025Open Atlantic Coast Championship Round 1BHarvard University (Crimson)College fleet racingA Crew2nd / 18
27 Sep 2025Moody TrophyHarvard University (Crimson)College fleet racingA Skipper11th / 18

Helm rating, Full-size sailing: 671, #553.Crew rating, Full-size sailing: 628, #555. Compiled from public results; not an official ranking.