
Taffe will oversee a team of seven people responsible for promoting advertising self-regulation.
Erkal-Paler has taken a job at the pharmaceutical company AstraZeneca.
Taffe joined the ASA in 2004 as policy and public affair advisor and was subsequently promoted to communications and policy manager.
Guy Parker, chief executive of the ASA, said: "Lynsay's knowledge of the ASA and our stakeholders is second to none, and her enthusiasm and communications expertise will be crucial in this role."