Christian joined the University of Liverpool and the Head and Neck Centre as Professor of Immuno-Oncology in August 2020. He was also appointed as Director of Clinical Research at The Clatterbridge Cancer Centre in 2020. Christian's core interest is the understanding and improvement of immune responses in patients; his aim is to develop immunotherapies against solid cancers.

He has served on a number of national and international peer review committees as well as on advisory boards and DSMBs for industry led studies. He is the early phase subspecialty lead on the CRN North West Coast Region, he is a member of EATI, the Cancer Vaccines Expert Working Group, the Scientific Strategy Committee for Breast Cancer Now and the Scientific Advisory Board for Cancer Research Malaysia.