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January 2020 marks the 25th Anniversary of Gene Therapy. To highlight this journal’s contributions over the last 25 years we have created an online collection of 25 papers: those most cited each year between 1997-2019, our most cited review ever and, as Editor’s Choice, a seminal paper describing AAV purification methods which is our top-four of all time. The collection features many major technologies: nonviral, AAV, adenoviral, retroviral and HSV vectors, microRNA, RNAi and genome editing, and the clinical trial of Glybera. We hope our readers will enjoy it. We raise a toast to the next 25 Years!