Bolliger & Mabillard, abbreviated B&M and formally known as Bolliger & Mabillard Consulting Engineers Inc., is a roller coaster design consultancy based in Monthey, Switzerland. The company was founded in 1988 by Walter Bolliger and Claude Mabillard, with Bolliger as president and Mabillard as vice-president. Since 1988, B&M has built 100 roller coasters around the world and have pioneered several new ride technologies, most notably the inverted roller coaster. Since 1990, all coasters designed by B&M that have been built within North America have been manufactured by Clermont Steel Fabricators which is located in Batavia, Ohio, United States. B&M started with four employees and has since grown; as of 2012 it employs 37 people, mostly engineers and draftsmen. In 2016 the company completed