Lang's appointment to the top marketing role is a result of the company's strategy to pool its brand and acquisition marketing teams. She takes up responsibility for both functions while continuing to report to AOL UK's chief executive and co-managing director Karen Thomson.
AOL's top marketing role was split between Lang and two other marketers after UK marketing director Keith Hawkins left to join rival Freeserve as chief marketing officer in January 2001.
Clare Lawrence, who has been director of customer acquisition, has moved out of the marketing department to take a new role in charge of special projects, although the company refused to comment on details of Lawrence's appointment.
The other joint top marketer Alex Boothroyd, left his role as director of customer operations last March to join Bertelsmann Financial Services as director of operations. AOL UK's £32m advertising business, epitomised by brand icon 'Connie', is held by Mortimer Whittaker O'Sullivan.
The company is poised to launch a TV campaign for AOL Broadband in an attempt to compete with BT Broadband's ongoing £33m campaign.
AOL slashed £8 off its broadband package price earlier this month to take it down to £27.99 a month, while Freeserve cut the price of its broadband product by £2, bringing it in line with both BT Broadband and AOL.
Lang joined AOL in February 2001 from the company's media planning and buying agency BBJ where she was direct marketing director. Before that she co-founded and jointly owned Mansfield Lang Direct Media and worked as a media manager at WWAV Rapp Collins.
AOL announced last week it was to bar pop-up advertising in an attempt to stop irritating its users, despite it being a lucrative revenue stream.
AOL UK is working on a number of cross-media deals with IPC Media following parent company AOL Time Warner's purchase of the magazine publisher last year. Citroen became the first advertiser to take advantage of this partnership in July.