[2] She earned a master's degree at the University of Chicago School of Public Policy.

[2][3] Sumption worked as Director of the Research at the Migration Policy Institute in Washington, D.C..

[10] There is evidence that the children of immigrants perform better than their parents, and earn more than their non-immigrant peers.

To improve social mobility, Sumption proposed considering the capacity of immigrants to integrate in selection criteria, to focus on early education and language training and to provide permanent (not temporary) visas.

[13][14] Sumption was appointed Member of the Order of the British Empire (MBE) in the 2018 New Year Honours for services to social science.