Horgan first trained as a photographer, before moving into directing TV commercials. He directed over 70 commercials and won Best Director and Best Photographer at the Irish Advertising Awards. His first short film, The Last Time, starring
Linda Bassett, received a nationwide cinema release in Ireland and was the recipient of the UIP Director Award and Best Irish Short at the
Cork Film Festival. Horgan's first feature film is
One Hundred Mornings, which premiered at the
Slamdance Film Festival in 2010, winning the
Special Mention Award. One Hundred Mornings also won the Vortex Sci-Fi & Fantasy Award at the
Rhode Island International Film Festival and the Writers Guild of Ireland Best Feature Film Script Award. In 2015, his feature documentary
The Queen of Ireland debuted in Ireland, breaking the record for an opening weekend for an Irish documentary. When 15 Horgan was a
puppeteer on the Irish children's program
Wanderly Wagon. He left school at 16 and spent several years travelling around Europe, working in Greece and Morocco as a geo-electrical surveyor for the University of Hamburg's Institut für Geophysik. == Visual arts practice ==