Alexandra studied Jurisprudence at Brasenose College, graduating in 1980. After completing her Law Society exams,  she trained at Rowe & Maw (now Mayer Brown), and then moved to Linklaters where she became a partner in 1990.

She stepped down from as an equity partner at Linklaters after 13 years, but remains associated with the firm. She has since built a portfolio of public, judicial and third sector roles. She now sits as a Deputy High Court Judge, Recorder and First Tier Tribunal Judge. After finishing terms as a Commissioner at the Judicial Appointments Commission and then the Criminal Cases Review Commission, she was recently appointed Statutory Reviewer of Access and Participation Plans for the Office for Students. She was also recently appointed Chair of CEDR (the Centre for Effective Dispute Resolution).