She has taken over from David Bulteel, who has become head of IW&I’s international division.
Hall joined the wealth manager as a graduate trainee in 1989 and has led its charities division since 2004, taking its assets under management to £2.8bn on behalf of nearly 1,200 charitable organisations.
She will continue to provide dedicated investment management and strategic advice to her existing charity and not-for-profit clients.
Jonathan Wragg, IW&I chief executive, said: “In addition to playing an instrumental role in expanding our charities division, Louise has been a highly regarded member of our senior management team in London for many years and is ideally suited to take over the leadership of our largest office.
“My sincere thanks go to David Bulteel for his tremendous contribution to the growth of the London team. I have every confidence that he will bring the same level of success to our international division.”
Hall added: “I am excited by this opportunity to lead the London office and look forward to working closely with my colleagues across the business to ensure we continue to deliver the highest level of service and investment management expertise to our clients.”