Labelled a  »Domestic Extremist« by the UK police, and »a magician of rebellion« by the French press, JJ likes in-between spaces of all sorts, especially between art and activism, culture and nature, the masculine and feminine.

They have intervened in museums, squats, International Theatre Festivals, climate camps, choreographed carnivalesque riots and written BBC radio plays. The are co-founder of Reclaim the Streets, that brought illegal rave and activism together; and the Clown Army, merging direct action and humour. They co-edited and co-authored We Are Everywhere: The irresistible rise of global anti-capitalism (Verso, 2003), The Users Guide to demanding the Impossible (with Gavin Grindon, Minor Compositions 2009) and the film/book Les sentiers de l'utopie (with Isabelle Fremeaux, La Découverte, 2011).

Since 2004, with Isabelle Fremeaux, they co-facilitate the Laboratory of Insurrectionary Imagination (Labofii), which is infamous for fermenting disobedience on bicycles, throwing snowballs at bankers, launching a rebel raft regatta to shut down a power station, and refusing to be censored by the Tate Modern. They inhabit the Zone A Deféndre (zad) of Notre-dame-des-Landes.