Andrew Tatrai is a crowd management professional with a 45 year history in major event management and crowd security. Starting Australian Concert and Entertainment security in 1980 and developing the first Australian Crowd management course in 1993, Andrew has used this experience to lead research to solve Crowd management by measuring the influence of crowd density and flow speed on crowd mood to alert and support in “the minute” action that is required by crowd managers. Current research area is measuring crowd sentiment as an extension of the 2022 PhD thesis “Emergent behaviour in crowds”.