HISTORY OF THE MUSEUM 
O. P. Hay, 
1900-1907 
Bashford 
Dean, 
1903- 
Field Staff. 
Museum 
Staff. 
Matthew was appointed Assistant and subsequently Associate Curator 
in Dr. Wortman's place. 
In 1900 Dr. O. P. Hay joined the staff as Assistant Curator, sub- 
sequently as Associate Curator of Chelonia in connection with the cata- 
loguing of the Cope Collection of Fossil Reptiha, and from 1904-7 
took especial charge of the arrangement and exhibition of the col- 
lections of extinct chelonians, while engaged upon his monograph 
upon this order of reptiles. 
In 1903 Dr. Bashford Dean was appointed Honorary Curator of 
Fossil Fishes, and in 1909 the living and fossil fishes were transferred 
to a distinct department under his charge. 
The field work of the department was at first in charge of Dr. J. 
L. Wortman assisted by Mr. O. A. Peterson and others. Since 1898 
Professor Osborn has exercised a general supervision over all field 
exploration, and he took personal charge of the Fayum Expedition in 
1907. The various expeditions in the Western States and elsewhere 
have been conducted by Messrs. Barnum Brown, Walter Granger, 
W. D. Matthew, J. W. Gidley, Albert Thomson, E. C. Case, Charles 
H. Sternberg, and L. S. Quackenbush, assisted by Messrs. Peter Kaisen, 
George Olsen, Paul Miller, F. B. Loomis, R. S. Lull, Handel T. Martin, 
H. W. Menke, William Stein, W. J. Sinclair, Roy L. Moodie, Harold 
J. Cook, Charles S. Mead, W. K. Gregory, A. E. Anderson, G. R. 
Wieland, J. D. Irving, Norman Grant, C. Forster Cooper, D. D. Streeter, 
and others. 
Since 1893 the laboratory work has been in charge of Mr. Adam 
Hermann, who has introduced and improved year by year the careful 
and skilful methods of preparation first employed by Professor Marsh. 
Under his training has grown up a staff of expert laboratory assistants. 
Mr. W. K. Gregory joined the staff in 1900 as research assistant. 
Mr. A. E. Anderson as Department photographer, Albert Thomson in 
field photography, Erwin Christman, Mrs. L. M. Sterling, and Miss 
Helen Cox in illustration have also contributed to the success of the 
department. 
• In 1895 Mr. Charles R. Knight commenced a series of restorations 
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