I was so sorry to hear of Jo’s death. She was a pioneer in the field of chronobiology and in particular the role of melatonin. Jo was such an inspiration to many and was a great advocate for many young scientists. Her work was intellectually rigorous and she was a fabulous, engaging speaker at conferences who always held your attention. Jo was great fun to be around at meetings. Her impact on the field was immense and the legacy she leaves behind is testament to her ability in championing others to succeed.