Professor Casewell is a graduate of the University of Liverpool (BSc Tropical Disease Biology), during which time he also studied at the Liverpool School of Tropical Medicine. Casewell’s interest in snake venom research developed at this point, ultimately resulting in a PhD studentship at Bangor University where he studied the composition, evolution and immunology of saw-scaled viper venoms and their antivenoms. The result of Professor Casewell’s PhD research saw him nominated as a finalist for the Society for Molecular Biology and Evolution’s young researcher prize, the Walter M. Fitch Award, in 2011. Subsequently, Casewell became Antivenom Manager for the UK manufacturing company MicroPharm Limited, in a commercial and academic collaboration with the Liverpool School of Tropical Medicine.
In 2012, Casewell was awarded an Independent Research Fellowship from the Natural Environment Research Council, UK to investigate the evolution and composition of different fish venoms, returning to Bangor University to conduct the research.
In 2014, Casewell was appointed as a Lecturer at the Liverpool School of Tropical Medicine and, subsequently, as a Senior Lecturer in 2016.
In 2016 Professor Casewell was awarded a Sir Henry Dale Research Fellowship by the Wellcome Trust and Royal Society to develop new treatments for tropical snakebite.
In 2019, Professor Casewell was appointed to a proleptic Chair in Tropical Disease Biology by the Liverpool School of Tropical Medicine.
Professor Casewell has published over 80 scientific papers on venoms and antivenoms, and he serves on the editorial board of the scientific journals Toxins and PLOS Neglected Tropical Diseases. His scientific research is funded by the Wellcome Trust, the Royal Society, the Medical Research Council, DFID, and NIHR.