In addition to producing innovative cross-media properties for television, he has written and directed eight award-winning feature documentaries that have been broadcast in more than 30 countries.
[3] A leading figure in the creation of participatory narratives he brought the underground genre of Alternate Reality Gaming into the Television mainstream, culminating in Xenophile Media's Emmy Award-winning Fallen[4][5] and Regenesis.
[6][7] In 2007 Wallner developed the story concept for Late Fragment,[8] Canada's first interactive feature drama produced by the NFB and the Canadian Film Centre.
[11][12][13] His documentary, The Guantanamo Trap won the Special Jury Prize at the 2011 Hot Docs film festival.
[14][15][16] Wallner described being put on the "no-fly list" in 2005, after declining to submit to an iris-scan when he tried to travel to the USA.