[3][4] In 2014, Mould co-hosted ITV's I Never Knew That About Britain alongside Paul Martin and Suzannah Lipscomb.

Mould's YouTube video on rising self-siphoning beads, in which he demonstrated the phenomenon and proposed an explanation,[5] brought the problem to the attention of academics John Biggins and Mark Warner of Cambridge University,[6] who published their findings about what has now been called the "chain fountain" in Proceedings of the Royal Society A.

[9] Since 2011, Steve has performed live science comedy as part of the comedic trio Festival of the Spoken Nerd, with mathematician Matt Parker and physicist singer Helen Arney.

[10][11] In 2011 Mould and Parker together started MathsGear.co.uk, a website aimed at selling stuff they prepare for their mathematics shows.

Mould's motive for starting the website was the constant inquiry from people to buy the stuff used in their shows.