He will report to Philip Crawford, who will continue to serve as executive chairman for the remainder of the financial year before Mr Crawford returns to his role as non-executive chairman with effect from 1 April 2016.
Mr Brown joins from Royal Bank of Scotland, where he worked for 15 years in a variety of technology leadership roles in global banking and markets, chief information officer of international banking and most recently head of eChannels, global transaction services,
He began his career in technology management at NatWest markets.
Mr Crawford, chairman of Lombard Risk Management, said: “Alastair has a wealth of experience and long track record of success in roles very relevant to our business. I am confident he will make a significant contribution to the development of Lombard Risk Management.”
Mr Brown has not held any directorships in the past five years.
He currently has no shareholding in Lombard Risk Management.