Jon Rees is a Principal Physical Oceanographer at Cefas (Centre for Environment, Fisheries and Aquaculture Science) in Lowestoft. With degrees from Warwick, Southampton and UEA, Jon has undertaken applied oceanographic research from the deep abyssal plains to the Wash salt marshes. Jon is part of Cefas’s Emergency response team giving advice to government departments on the fate and impact of oil and chemical spills around the UK using a variety of tools including numerical models. Jon has further developed these numerical models to predict the fate of missing persons in the marine environment and conversely, the potential entry point into the sea of missing persons found along the coastline. These predictions enable the police to use their resources in an effective and efficient manner to recover/identify the Missing Persons. Operationally, Jon gets requests from POLSAs around the country as well as from the NCA on an approximately fortnightly basis. He has been involved in several high-profile cases such as the murder of Libby Squires in Hull and the Missing person case involving Gaia Pope in Swanage.