Some context: Randi was born on August 7, 1928 in Toronto, Ontario, Canada, the son of Marie Alice (nee Paradis) and George Randall Zwinge. He has a younger brother and sister. He took up magic after seeing Harry Blackstone Sr. and reading conjuring books while spending 13 months in a body cast following a bicycle accident. He confounded doctors who expected he would never walk again.
Randi is the author of ten books, among them Conjuring (1992), a biographical history of noted magicians. The book is subtitled Being a Definitive History of the Venerable Arts of Sorcery, Prestidigitation, Wizardry, Deception, & Chicanery and of the Mountebanks & Scoundrels Who have Perpetrated these Subterfuges on a Bewildered Public, in short, MAGIC! The book's cover says that it is by "James Randi, Esq., A Contrite Rascal Once Dedicated to these Wicked Practices but Now Almost Totally Reformed". The book selects the most influential magicians and tells some of their history, often in the context of strange deaths and careers on the road. This work expanded on Randi's second book titled Houdini, His Life and Art. This illustrated work was published in 1976 and was co-authored with Bert Sugar. It focuses on the professional and private life of Houdini.  Randi also wrote a children's book in 1989 titled The Magic World of the Amazing Randi, which introduced children to magic tricks. In addition to his magic books, he has written several educational works about paranormal and pseudoscientific claims. These include biographies of Uri Geller and Nostradamus as well as reference material on other major paranormal figures. He is currently working on A Magician in the Laboratory, which recounts his application of skepticism to science. He was a member of the all-male literary banqueting club the Trap Door Spiders, which served as the basis of his good friend Isaac Asimov's fictional group of mystery solvers, the Black Widowers.  Other books are Flim-Flam! (1982), The Faith Healers (1987), James Randi, Psychic Investigator (1991), Test Your ESP Potential (1982) and An Encyclopedia of Claims, Frauds, and Hoaxes of the Occult and Supernatural (1995).  Randi was a regular contributor to Skeptic magazine, penning the "'Twas Brillig..." column, and also served on its editorial board. He is also a frequent contributor to Skeptical Inquirer magazine, which is published by CSI, of which he is also a Fellow.
Does he debunk the claims?
A: He is currently working on A Magician in the Laboratory, which recounts his application of skepticism to science.

Some context: David Thompson was born in Westminster, Middlesex, to recent Welsh migrants David and Ann Thompson. When Thompson was two, his father died. Due to the financial hardship with his mother without resources, Thompson and his older brother were placed in the Grey Coat Hospital, a school for the disadvantaged of Westminster. Thompson graduated to the Grey Coat mathematical school, where he was introduced to basic navigation skills.
Upon his arrival back in Montreal, Thompson retired with a generous pension from the North West Company. He settled in nearby Terrebonne and worked on completing his great map, a summary of his lifetime of exploring and surveying the interior of North America. The map covered the wide area stretching from Lake Superior to the Pacific, and was given by Thompson to the North West Company. Thompson's 1814 map, his greatest achievement, was so accurate that 100 years later it was still the basis for many of the maps issued by the Canadian government. It now resides in the Archives of Ontario.  In 1815, Thompson moved his family to Williamstown, Upper Canada, and a few years later was employed to survey the newly established borders with the United States from Lake of the Woods to the Eastern Townships of Quebec, established by Treaty of Ghent after the War of 1812. In 1843 Thompson completed his atlas of the region from Hudson Bay to the Pacific Ocean.  Afterwards, Thompson returned to a life as a land owner, but soon financial misfortune would ruin him. By 1831 he was so deeply in debt he was forced to take up a position as a surveyor for the British American Land Company to provide for his family. His luck continued to worsen and he was forced to move in with his daughter and son-in-law in 1845. He began work on a manuscript chronicling his life exploring the continent, but this project was left unfinished when his sight failed him completely in 1851.
Did he have any other achievements?
A:
In 1843 Thompson completed his atlas of the region from Hudson Bay to the Pacific Ocean.