A native of Queens, New York, Bryn 

 J. Mader (page 61 ) knew from a very 

 early age that he wanted to be a vertebrate 

 paleontologist. His professional interest in 

 titanotheres, however, began as a gradu- 

 ate student in vertebrate zoology at the 

 University of Massachusetts at Amherst, 

 when he recalled having seen a series of 

 massive, homed titanothere skulls in the 

 American Museum's Osbom Hall of 

 Mammals. When he found that titano- 

 theres had been neglected since Henry 

 Fairfield Osbom published his mono- 

 graph on them in 1929, he was hooked on 

 studying the extinct beasts. After receiv- 

 ing his Ph.D. from the University of 

 Massachusetts in 1991, Mader moved to 

 the American Museum, where he started 

 in the Department of Vertebrate Paleon- 

 tology as an assistant collections manager 

 working with fossil mammals. Now col- 



As a graduate student at Columbia 

 University in the 1970s, Bruce MacFad- 

 den (page 63) had the opportunity to 

 study the extensive fossil horse collection 



A professor of anatomy at Howard 

 University in Washington, D.C., Daryl 

 Domning (page 72) has written several 

 articles on fossil sirenians, or sea cows, 

 for Natural History. Much of his field- 

 work takes place in such warm parts of 

 the world as Puerto Rico, Mexico, and 

 Brazil, where sea cows and their fossil 

 ancestors can be found. His interest in the 

 Caribbean dugongs was sparked by some 

 surprising fossil discoveries over the past 

 fifteen years, which raised questions 

 about ancient ecology: "The world is al- 

 ways stranger than we imagined," notes 

 Domning, "and life in the past was more 

 different from the present than we know." 

 In addition to piecing together the evolu- 



lections registrar in the Department of 

 Mammalogy, Mader has traveled to the 

 Badlands of South Dakota to look for 

 more North American titanotheres and 

 hopes to extend his research to Mongolia, 

 where large numbers of titanotheres have 

 been found. 



at the American Museum of Natural His- 

 tory with the encouragement of Morris 

 Skinner, the world's foremost horse ex- 

 pert at that time. Since then, MacFadden 

 has focused his studies on the paleobiol- 

 ogy and evolution of horses. Now a cura- 

 tor of vertebrate paleontology at the 

 Florida Museum of Natural History, he 

 continues to excavate fossil horses and 

 conduct geochemical studies of their teeth 

 to determine ancient diets and ecology. 

 His book Fossil Horses was published by 

 Cambridge University Press in 1992. 

 Also a professor of geology, zoology, and 

 Latin American studies at the University 

 of Florida in Gainesville, MacFadden is 

 currentiy on a Fulbright fellowship in Bo- 

 livia, studying the geology and paleontol- 

 ogy of the Andes. 



tion and natural history of extinct sireni- 

 ans, Domning is deeply involved in pro- 

 tecting living dugongs and manatees. 



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