His mother was descended from Christopher Osgood, who came from Marlborough, England, on the ship Mary and John in 1633 and settled at Ipswich, Massachusetts.

[7][8][9] His notable cases include In re Terui (1921), and In re Kotta (1921), in which he wrote the opinion striking down the alien poll tax adopted in the previous session of the California legislature.

[10][11][12] After his resignation, he became general counsel for the Western Pacific Railroad Company, a position previously held by his court colleague Warren Olney Jr.[13][14] Starting in 1918 he was lieutenant-governor for California of the Society of Colonial Wars.

They had two children: Frances Louise (died in infancy) and Marion Polk Angellotti, an author.

Frank Angellotti died on May 23, 1932, and was buried at Mount Tamalpais Cemetery in San Rafael.