The A Circuit
GEORGINA BLOOMBERG is the younger daughter of New York City mayor Michael Bloomberg. An accomplished equestrian, Georgina is on the board of directors of the Equestrian Aid Foundation. She is also the founder of the charity Rider's Closet.www.georginabloomberg.comCATHERINE HAPKA has published many books for children and young adults, including some about horses. A lifelong horse lover, she rides several times per week and keeps three horses on her small farm in Pennsylvania.