Geissler joined Scottish Television (now STV Central) in February 1994 as a reporter, sports presenter and newsreader for Scotland Today.
[3] He joined ITN in April 2002 as ITV News' Scotland Correspondent but was also involved with coverage of major international stories including the Second Gulf War, the Asian tsunami and Hurricane Katrina in New Orleans.
In January 2024, Geissler took over from John Beattie as the main presenter of BBC Radio Scotland's Drivetime programme with Fiona Stalker.
[5] He held this position for a year before leaving to become the main presenter of BBC News Scotland's podcast series Scotcast airing from 13 January 2025.
[6] Geissler also hosted the BBC's first ever dedicated Scottish results programme for a general election on 6 July 2024.