Wringe joins ex-Barclays and Gyro head of live events Dina Green, who is managing director of the UK operation.
He has spent over 30 years managing creative agencies including stints at Cogent Elliott, Publicis, WPP-red cell and Sandom Group.
Since 2006, he has been running his own outsource marketing consultancy working with major brands across a number of sectors – as well as involvement in a handful of other specialist marcomms businesses.
He said: "I meet many agencies but was immediately enamoured with the Invnt founders and their story. I am staggered by their US success in immediately attracting big, blue chip clients as well as developing a uniquely creative product. I look forward to helping replicate that success here in the UK and on a global scale."
Launched in the US in 2008, Invnt boasts clients including Pepsico, General Motors, News Corporation and Merck. It has five offices in London, New York, Washington DC, Detroit and Jacksonville.
Invnt’s managing partner Scott Cullather added: "John’s ethos is perfectly matched with that of Invnt and he brings a vast network of business knowledge along with significant M&A and global growth experience which fits nicely into our ambitious strategic growth plans."