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.