Stanley LeFevre Krebs (January 14, 1864 – September 26, 1935) was an American psychologist and salesmanship lecturer.

Krebs was a one time president of the American University of Trade and Applied Commerce of Philadelphia and a pastor in the Reformed Church.

[1] He was the president of the American Institute of Mercantile Art, Philadelphia, where he worked as a salesmanship lecturer.

He employed a secret mirror and caught the medium Henry Slade swapping slates and hiding them in the back of his chair.

[3] Krebs exposed the Bangs Sisters by using a secret mirror under the table, which caught them tampering with a sealed envelope.