american expat brad reynolds wrote his first review in 2010 while visiting saint petersburg , russia .
the 38-year-old teacher critiques every hotel , restaurant and landmark he visits on holiday .
brad 's 66,000 contributions to the travel website include nearly 40,000 photos of the places he has visited .
the teacher has posted reviews from nearly 400 cities and almost 50 countries .
now living in hong kong , his travel tips have been read by millions of people around the world .