Hans Frederick Blichfeldt

He worked for several years as a lumberman, a railway worker, a traveling surveyor, and then as a government draftsman in Bellingham, Washington.

He did not have a high school diploma, so he had to be admitted as a special student, with a letter of support from his drafting supervisor.

[1][4][6] His doctoral dissertation, On a Certain Class of Groups of Transformation in Three-dimensional Space, was supervised by Sophus Lie, and he graduated summa cum laude.

[2] He died on November 16, 1945, in Palo Alto, California, of complications following an operation for a heart attack.

[10][A3] With George Abram Miller and Leonard Eugene Dickson, Blichfeldt wrote a comprehensive 1916 text on what was known at the time in the theory of finite groups.

[11] Blichfeldt's own book, published a year later,[B2] expanded his exposition of linear transformation groups.

[4][12][6][11] Blichtfeld's later work largely concerned lattices, the geometry of numbers, sphere packings, and quadratic forms.

[13][A4] In a 1929 paper, Blichfeldt improved the bounds on the Hermite constant for shortest vectors in a lattice.