•
Elizur Wright (1804–1885), American, campaigned for valuation laws requiring life insurance companies to hold reserves to guarantee payment of benefits •
Wesley S. B. Woolhouse (1809–1893), English, co-founder of the Institute of Actuaries •
James Joseph Sylvester (1814–1897), English •
Ole Jacob Broch (1818–1889),
Norwegian, founded
Christiania almindelige gjensidige Forsørgelsesanstalt,
Scandinavia's first life insurance company •
Ernst Engel (1821–1896),
German, founded the first mortgage insurance company at
Dresden •
Thomas Bond Sprague (1830–1920), British •
Esprit Jouffret (1837–1904), French •
Thorvald N. Thiele (1838–1910),
Danish •
Emory McClintock (1840–1916), American •
Anders Lindstedt (1854–1939),
Swedish •
Thomas Bassett Macaulay (1860–1942),
Canadian •
Thomas Jaffrey (1861–1953), Scottish •
Miles Menander Dawson (1863–1942), American •
Gabriel Gabrielsen Holtsmark (1867–1954), Norwegian •
George James Lidstone (1870–1952), British •
Joseph Burn (1871–1950), English •
Johan Frederik Steffensen (1873–1961),
Danish •
Alexander Jobson (1875–1933),
Australian •
Maurice Princet (1875–1973),
French •
Henry Louis Rietz (1875–1943), American •
I. M. Rubinow (1875–1936),
Russian •
Alfred M. Best (1876–1958), American, founder of the
A. M. Best company •
Filip Lundberg (1876–1965), Swedish, founder of mathematical risk theory and managing director of several insurance companies •
William Palin Elderton (1877–1962), English •
Alfred J. Lotka (1880–1949), American •
Sverre Krogh (1883–1957), Norwegian •
Harald Cramér (1893–1985), Swedish, developed numerous statistical theories and methods •
Ivo Lah (1896–1979),
Slovene •
Dorothy Spiers (1897–1977), first woman to qualify as an actuary in the United Kingdom •
Henrik Palmstrøm (1900–1998), Norwegian ==Born in the 20th century==