sentences:  After returning from Korea, Axelrod earned a Ph.D. in biostatistics at New York University and started the magazine "Tropical Fish Hobbyist".He wrote many other books on tropical fish and founded a publishing firm, TFH Publications (named for the magazine) that became the largest publisher of pet books in the world.TFH Publications was headquartered first in Jersey City, New Jersey, and then in Neptune, New Jersey.