Michael Roberts will take over as chief executive officer (CEO) of London TravelWatch from January.
The transport watchdog said Mr Roberts has 30 years’ experience in advocacy and influencing public policy, much of it relating to transport.
It added that his appointment comes as transport users across London face increasing challenges, with London TravelWatch demanding improvements on key issues such as personal security, retaining quality bus services, communication across all services, and making sure transport is accessible for everyone.
Chair Arthur Leathley said: ‘Michael has wide experience of transport from his previous senior roles and is also very familiar with the key issues that affect millions of people travelling in London.
‘At a time of great change, Michael’s knowledge and skill will be invaluable.’
Mr Roberts said: ‘Transport is integral to the life of every Londoner, yet the challenges involved in delivering an affordable, efficient and green transport system, accessible to all, have rarely been greater.
‘The views of the travelling public matter more than ever and, together with the London TravelWatch team, I look forward to ensuring their voice is heard by decision-makers at this critical time.’
Mr Roberts has been director-general at the Rail Delivery Group and chief executive at the Association of Train Operating Companies (ATOC), where his team were responsible for providing services such as National Rail Enquiries.
He is also a former member of the Commission for Integrated Transport, and the Motorists’ Forum.
His most recent role was as chief executive of Water UK and he is a former board member of The Carbon Trust.
Joanna Davidson will continue as interim CEO until the new year.
London TravelWatch is sponsored and funded by the London Assembly and deals with services operated or licensed by Transport for London, as well as most of the major roads in Greater London and services operated by National Rail companies, Heathrow Express and Eurostar.
