Isaac Wheeler Geer (February 1, 1873 – June 20, 1953) was an executive with the Pennsylvania Railroad known for his involvement in labor disputes.

[1][2] After graduating from Phillips Academy, Andover, Isaac attended Yale, earning several awards in science and mathematics.

[1] After graduating, Geer worked as an engineer on several major rail lines through the Midwest.

[6] During hearings of the United States Railway Labor Board, union lawyers failed to prove the authenticity of the letter.

Isaac Wheeler Geer died at his home in Chicago on June 20, 1953.