Michael Robertson is an author known for writing legal thrillers and mysteries, particularly the series featuring the character "Baker Street Letters," which involves a law practice located at the famous 221B Baker Street address in London. The series mixes elements of contemporary legal drama with callbacks to Sherlock Holmes, as the protagonists receive letters addressed to the fictional detective and find themselves embroiled in various adventures. Besides his work in fiction, Michael Robertson has a background in legal practice, which he draws upon to lend authenticity to his novels. Since there might be multiple authors with the name Michael Robertson, ensure you have the correct one in mind. If you are referring to a different Michael Robertson in another context, please provide additional details for more accurate information.