Use stream of consciousness to answer the following. Jerome Avenue was put together as a plank road in 1874 for $375,000. It appeared on maps as Central Avenue, because it started from Macombs Dam Bridge to Jerome Park Racetrack. Borough President Louis F. Haffen selected contractors in 1897 to pave Jerome Avenue. Three sections of the road were to be remodeled, costing the Bronx about $136,505. The street was to be renamed after an unknown city alderman. Kate Hall Jerome, wife of Lawrence Jerome, was furious, replacing all the signs with the name Jerome Avenue in honor of Jerome Park Racetrack opened by her husband's financier brother, Leonard Jerome in 1866. When the subway line was commissioned, Jerome went from rural road to commercial artery.

Answer this question based on the passage: who is jerome avenue in the bronx named after?
The important part for answering this question is: Kate Hall Jerome, wife of Lawrence Jerome, was furious, replacing all the signs with the name Jerome Avenue in honor of Jerome Park Racetrack opened by her husband's financier brother, Leonard Jerome in 1866. Final answer: Leonard Jerome.