Sion graduated with an MPharm degree from UEA in 2015. He started his professional career in hospital pharmacy at the Royal Liverpool and Broadgreen University Hospitals NHS Trust as a pre-registration pharmacist and subsequantly a rotational pharmacist. In 2016 Sion returned to UEA to undertake a PhD under the supervision of Dr Debi Bhattacharya developing a theory-informed model for deprescribing in hospital. Sion continues to practice as a hospital and primary care pharmacist.