Main Page | See live article | Alphabetical index Alfred Jules Ayer (October 29, 1910 - June 27, 1989) was a philosopher who helped popularise logical positivism in English-speaking countries in his books Language, Truth and Logic (1936) and The Problem of Knowledge (1956). This article is a stub. You can help Wikipedia by expanding it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.