William David Butler-Adams (born 11 May 1974 in London)[1] OBE[2] FRGS is the managing director of Brompton Bicycle Limited[3][4][5][6] a manufacturer based in the United Kingdom[7] and Brompton Bike Hire Limited[5] a provider of bicycle-sharing systems.

[1] He joined Brompton at the age of 28,[12] following a serendipitous meeting with the company's chairman, Tim Guinness, on a coach journey.

[14][15][16] Butler-Adams has been a member of the Institution of Mechanical Engineers (MIMechE) since 1993 and a Fellow (FIMechE) since 2014.

[17] His recreations include aviation (he holds a private pilot licence) and wine (he has been a Liveryman of the Worshipful Company of Vintners since 2010).

[1] Other recreations include travel and the environment: in 1995 he led a nine-week expedition up the Amazon River, which was the subject of a Channel 4 documentary[better source needed] and also led an expedition to summit of Aconcagua in 2000, which raised over £130,000 for charitable causes.