Mary Ann Corinna Howard Sieghart (born 6 August 1961)[1] is an English author, journalist, radio presenter and former assistant editor of The Times, where she wrote columns about politics, social affairs and life in general.

[2] She is a visiting professor at King's College London and chaired the Social Market Foundation, an independent think tank, from 2010 to 2020.

[3] She was appointed a Visiting Fellow of All Souls College, Oxford, for the academic year 2018–19, where she researched The Authority Gap.

Her father, whose parents divorced when he was two, was raised Catholic as his maternal grandfather Rudolf Sieghart (né Singer) had converted from Judaism.

[1] She won a scholarship to Wadham College, Oxford, when she was 16, and graduated with a first-class degree in Philosophy, politics and economics in 1982.

Deedes notes that "Let loose on the leader page, Mary Ann wove a sometimes startling liberal thread through the Daily Telegraph's blue tapestry."

He offered her a job on graduation but simultaneously advised her to apply elsewhere because the Daily Telegraph was in financial trouble.

[8] After Oxford, Sieghart joined the Financial Times, where she became Eurobond Correspondent and then a Lex columnist.

Sieghart is visiting professor at King's College London and Non-Executive Director of the Guardian Media Group, Pantheon International and The Merchants Trust plc.