Delo became one of the youngest-ever signatories of The Giving Pledge in 2019, promising to give away the majority of his wealth during his lifetime. Since stepping back from an executive role that year, he says philanthropy has become his main focus and claims to have donated more than £100m to a range of causes.

Delo has been “motivated by the pursuit of truth” throughout his life and career, and by a “commitment to rationalism, intellectual honesty and frank, open debate”.

It is these “rationalist principles” that guided his money giving, with an initial focus on causes related to “free enquiry and academic freedom, mathematics education and research, neurodiversity and young people with autism, and fostering collaboration across the…