Thomas started his career in public service at Trafford Council in 1999, and then joined Derbyshire County Council (2006–14), becoming director of children’s services from 2011 to 2014. During this time, the number of children in Derbyshire who achieved five or more GCSEs trebled in a single year. Ofsted praised Thomas's leadership for creating "a culture of learning, support and challenge."[2]
Rotherham Borough Council
Thomas was initially headhunted on a one-year contract by Malcolm Newsam, the children's social care commissioner appointed by the government to oversee children's and young people's services in Rotherham in the wake of the Jay Report by Professor Alexis Jay.[2] As Rotherham Metropolitan Borough Council's strategic director for children and young people from 2015 until 2018,[3] Thomas transformed the council's social services,[4] being appointed CBE in the 2019 New Year Honours for services to local government and children's services in the wake of the Rotherham child sexual exploitation scandal.[1]
Lewisham Council and Kingston upon Thames Council
He was chief executive of the London Borough of Lewisham in 2018, before serving as CEO of the Royal Borough of Kingston-upon-Thames (2019–23) where he led a £1.2bn regeneration programme providing an additional 1,338 new homes in Kingston,[5] plus investment in schools, leisure and cultural facilities, new jobs and apprenticeships, and inward investment, including Unilever's new global HQ.[1]
Corporation of the City of London
Appointed Town Clerk and chief executive of the City Corporation in February 2023, Thomas also oversees the City of London PoliceAuthority. As Town Clerk, a position dating back to the 13th century, Thomas acts as head of the paid service, leading over 4,000 City Corporation staff, and is principal advisor to elected Commoners on matters of policy.[1][6]