I joined Apple two weeks after the initial release of Maps in 2012.
For the first few years,
I worked on the Routing Engine for Driving and Walking Directions (the back end for Turn-by-Turn Navigation).
I have been working on Traffic.
Previously, I did research on efficient algorithms and data structures, and I taught at MIT and at the University of Tokyo.
Fast Map Matching with Vertex-Monotone Frechet Distance (ATMOS 2021)
Traffic-Aware Routing in Road Networks (ICDE 2018)
All-Pairs Approximate Shortest Paths and Distance Oracle Preprocessing (ICALP 2016)
On Balanced Separators in Road Networks (SEA 2015)