He will report to Richard Stainer, the chief executive of TBWA\London, and help develop the shop’s production capabilities.
Stainer said: "Josh arrives having created some of the biggest, boldest campaigns of today and is a testament to the mantra that a great idea is nothing unless it’s made."
Tenser will work with client teams to up-skill and make better use of technology.
He was at Acne for almost a year, looking after its digital business in the UK. Tenser was previously a freelance executive producer at 72andSunny for four months. In January last year, he founded Wilderness, a creative production company.
Tenser spent two years as the head of interactive production at Bartle Bogle Hegarty, managing its digital growth between 2012 and 2014.
Other roles during his 18-year career include head of production at Stinkdigital, production director at Work Club and senior producer at Iris Digital.
Tenser said: "Like many in the industry, I’ve been a keen observer of TBWA\London for some time now, watching the agency gather momentum as it moves towards a truly integrated offer."
Gabriela Lungu, the former UK and EMEA chief creative officer at Weber Shandwick, joined TBWA\London as a creative director in July.
The agency also recruited Amelia Torode, the former head of strategy and innovation at VCCP, as its chief strategy officer in November last year.