demograph and American mathematician ( Lemberg, Ostrich
1880 - New York , 1949 )

Foundator of the mathematics demography, he has defined
the notion of stable and stationary population; a big part of his work
is present in his theory analytic of biologics associations ( 1934 - 1939
)

Others books : The money value
of the man ( written with Louis Dublin, 1930 )

Lenght of life ( 1936 )

Twenty five years of the Health Progress ( 1937 )