Dan Lasserson is Professor of Acute Ambulatory Care at the University of Warwick, working clinically in acute ambulatory care and the hospital at home service for Oxford University Hospitals NHS Foundation Trust and Sandwell and West Birmingham NHS Trust. He is a founder member of the UK Hospital at Home Society. He has previously worked in primary care as well as hospital medicine and is the Theme Lead for Acute Care Interfaces in the NIHR Applied Research Collaboration (ARC) West Midlands. He is also Theme lead for Acute Ambulatory Care in the NIHR Community Healthcare MedTech and In-Vitro Diagnostic Cooperative (MIC). He is the chief investigator of an NIHR Policy Research Programme study examining the optimal acute medical care delivery model during winter and waves of COVID-19. He leads the NIHR STOPAPE trial on the management of sub-segmental pulmonary embolism and sits on the NIHR Health Technology Assessment funding committee. He is a co-applicant on the NIHR CONDOR study, examining point of care tests for COVID-19 and AVID-CC, a Wellcome Trust Therapeutics Accelerator funded trial examining how a TNF antibody could improve outcomes for patients in care homes with COVID-19. His work for the Society for Acute Medicine includes leading its national hospital benchmarking audit (SAMBA), sitting on the Society for Acute Medicine's Research Committee and being a member of the Editorial Board of the Acute Medicine Journal.