In Mexico he began to methodically study occultism, gnosis and spiritualism, becoming familiar with the works of Helena Blavatsky, Louis Claude de Saint-Martin, Papus and Eliphas Lévi.

According to the American Military Intelligence Division MID, Krumm-Heller worked for Felix A. Sommerfeld in the Mexican Secret Service in January 1912.

Then-Governor James E. Ferguson, with the prodding from the German secret service agent, was the first U.S. state executive to formally recognize the Constitutionalists in the Mexican Revolution as the legitimate government of Mexico.

[2] Appearing in El Paso in the summer of 1913, the trained doctor met up again with Carranza and served as a colonel in the Constitutionalist army.

He became General Álvaro Obregón's chief of artillery, an occupation many German and American mercenaries such as Emil Lewis Holmdahl, Sam Dreben, and Tex O'Reilly pursued.

In the German army, training focused on the effective use of canon in combination with cavalry attacks, a strategy that Mexican revolutionaries knew very little about.

"In the issue of his magazine Rosa Cruz, dated April 27, 1933, he spoke of Hitler as a stormy fighter of the working class whose ideas should be adopted by all countries.