Through Dr. Jerome Rozen's worldwide research on the biology, immature stages, and evolutionary relationships of bees (Hymenoptera: Apoidea), the American Museum of Natural History houses what is believed to be the most complete collection of bee eggs, larvae, and pupae. Since 1949, Dr. Rozen has conducted fieldwork in Namibia, Turkey, Brazil, Pakistan, and Peru, among many other locations. One of his current research projects is work with international colleagues on Brazilian solitary and cleptoparasitic bees. The results of his research have been reported in more than 120 research papers.