At four years old, he began his acting journey with a standout cross-dressing lead role as 'Madame Diptheria Iceberg' in a school production, marking the inception of a lifelong passion for performance.

He is most well known for appearing in feature films The Smoke as Dean and London Town as Ronnie, as well as voicing Simon "Ghost" Riley in Call of Duty: Modern Warfare.

[2] Educated at the John Lyon School for boys in Harrow he obtained a degree from the University of Warwick in English Literature and Theatre Studies.

[citation needed] Leach began his stand up career in February 2010, performing on the UK comedy circuit and at the Edinburgh Fringe Festival.

He performed at the Edinburgh Fringe Festival in 2011 and 2012 with promoters Live Nation becoming a Top Ten Finalist in the Amused Moose Laugh Off Competition 2012.

In 2013 Jeff completed a role in short film Shop Girl Blog and played rocker Lenny in online comedy series The Chaos.

[16] Leach, with THINND, hosted a Juneteenth gaming stream, raising over $31,435 for the Equal Justice Initiative in honor of George Floyd.