NYC’s Parallel Worlds Collide for Police Boss Tisch After Attack

It was just after 1:30 a.m., and Jessica Tisch was walking the eerie quiet of 345 Park Avenue, surveying the detritus of a deadly attack.

As the scrunch of broken glass cut the silence and blood still glistened on the floor, a distraught Tisch confronted her most challenging moment yet as New York City’s police commissioner. Mere hours earlier, a lone gunman with an assault rifle stalked this very space, ending the lives of four people before taking his own.

Tisch’s critical role had already placed her at the nexus of business, law enforcement and politics. Now, the city’s worst ...