A. Bothwell-Gosse, S. L. MacGregor Mathers

The provided text is a Wikipedia disambiguation page listing individuals named Peter across various fields, primarily sports. It does not contain biographical information or specific details about the individuals A. Bothwell-Gosse and S. L. MacGregor Mathers. Therefore, it is not possible to extract any content related to their lives, works, or contributions from this source.

The text is organized into sections detailing different occupations and categories, such as Business, Entertainment, Journalism, Justice, Literature, Military, Nobility, Politics, Religion, Science (including Medicine, Physics, and Political science), and an extensive list of Sports categories. Within these categories, numerous individuals named Peter are listed with their birth years and primary achievements, predominantly in athletic pursuits. The 'Other occupations,' 'Disambiguation,' 'Fictional characters,' and 'See also' sections further serve to categorize and link to related topics. The 'References' section indicates the source of the information. However, no information pertaining to A. Bothwell-Gosse or S. L. MacGregor Mathers is present.