Doctor A. Leech (French: Docteur Daumière) is Captain Haddock's primary care doctor. He sends Haddock a note stating that he cannot drink or bring any alcohol on board the Sirius. This note is written in Red Rackham's Treasure.
He also appears in The Castafiore Emerald. He treated captain's sprained angle which was ocurred because Arthur Bolt didn't came to Marlinspike to fix the broken step.