Len is Professor of Gene Therapies at Oxford University, and a leading expert in nucleic acid delivery systems. He founded the British Society for Gene and Cell Therapy in 2003, which he also led for 9 years. He is a co-founder of AkamisBio, OXGENE (sold for $135M, 2021), Theolytics, and the Native Antigen Company (sold for $23.5M, 2019). He has authored >300 peer reviewed papers and raised over $40m in research grant funding.