Louise will lead on all of the CLA's work on tax policy and the provision of advice to its members.
She said: "I am delighted to join the CLA and to have the chance to use my long experience of advising and lobbying on taxation issues to benefit members. I hope to build on the Association's strong reputation in this field."
CLA Director of Policy and Advice Christopher Price said: "We are very pleased to have someone of Louise's outstanding track record and undoubted calibre joining us in this key role. Taxation is a major issue for the CLA and indeed one of the reasons the Association came into being in the first place."
Louise, a solicitor, previously spent 13 years as Tax Policy Adviser with The Law Society.