Krebs became active on the lecture circuit after leaving full time parish work. Within two years he appeared on nearly one hundred platforms in six states and received recalls in almost half of them. He lectured before lyceum audiences, chautauqua assemblies, teachers institutes, trade conventions, retailers associations, and civic organizations. His subjects included mind reading, the occult sciences, psychology of suggestion, management, and salesmanship. He also lectured for the
University of Minnesota’s merchants course and appeared before various scientific and professional societies. Krebs traveled extensively in Europe giving lectures and doing research. He also made a special academic trip to North Africa for psychological studies.
Salesmanship and business training During the 1920s, Krebs applied his psychological work on suggestion to salesmanship and business instruction. His lectures presented selling as an extension of mental discipline and framed commercial success as an application of psychological principles. He promoted what he called the religion of business, which combined enthusiasm, ethical influence, and subconscious persuasion to support long term customer relationships. Krebs advised salesmen to use auto-suggestion to build traits such as confidence and loyalty and compared subconscious influence in selling to repeated advertising campaigns that shaped public preference through iteration. His books connected psychology with business practice, including
Twin Demons on fear and worry in professional settings,
Salesmanship, and
Retail Salesmanship he wrote for the Institute of Mercantile Art. In 1929 he entered the Episcopal priesthood, combining his psychological background with religious work. == Personal life ==