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 founding 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) and has an interest in how point-of-care diagnostics can support acute care decision making. 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, an NIHR PRP funded study on how Acute Hospital at Home models can expand their scope of clinical work and sits on the Clinical Reference Group for NHS England's Virtual Ward/Hospital at Home Programme.

He has led the Society for Acute Medicine national hospital benchmarking audit (SAMBA) and now sits on the Society for Acute Medicine's Research Committee as well as the Editorial Board of the Acute Medicine Journal.