Andrew joined DLA Piper in 1981 and practised as a Corporate lawyer, becoming a partner in 1987. He has held a number of senior leadership positions within the firm, including Head of Corporate, Managing Director of the EMEA region, UK Managing Partner, Australian Managing Partner, Chief Operating Officer (for the firm's non-US operations) and Managing Director, Developing Markets (with responsibility for a number of regions, including the Nordics, the Middle East, Africa and India).

On 9 February 2018, Andrew was elected as Senior Partner of DLA Piper International. He is also Global Co-Chairman.