HANNAH MATHIESEN, OAKMONT HORSE CLUB Favorite: My favorite racehorse of all time is definitely American Pharoah (Pioneerof the Nile). He was running when I was first getting involved in racing, and I followed him closely since he ran early in his career at my home track, Del Mar. One day, a family friend who writes for the local newspaper said she was going to interview Bob Baffert, and asked if I wanted to come along to be her photographer. Having only been to the backside a handful of times and...