This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) The topic of this article may not meet Wikipedia's notability guideline for biographies. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted.Find sources: "David Lewis" psychologist – news · newspapers · books · scholar · JSTOR (September 2017) (Learn how and when to remove this template message) This biography of a living person needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately from the article and its talk page, especially if potentially libelous.Find sources: "David Lewis" psychologist – news · newspapers · books · scholar · JSTOR (December 2015) (Learn how and when to remove this template message) This biography of a living person relies too much on references to primary sources. Please help by adding secondary or tertiary sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately, especially if potentially libelous or harmful.Find sources: "David Lewis" psychologist – news · newspapers · books · scholar · JSTOR (January 2008) (Learn how and when to remove this template message) (Learn how and when to remove this template message)