As a senior investigative journalist he has broken numerous stories as well as covering national and international events.
[3] Before Man Monis was involved in the infamous Sydney Siege he was initially investigated by David Richardson.
In the inquiry into the Siege ABC reported, "Channel 7 reporter David Richardson said after he did a 2009 television story about Monis sending letters to the families of Australian soldiers, Monis complained to the Australian Communications and Media Authority who dismissed his complaint."
Network Seven's six-month investigation found no official confirmation from the Iranian community that Monis was even a real sheik.
[4] After a five-year court battle in July 2009, the Seven Network was ordered to pay mortgage broker Peter Mahommed $240,000 after a 2004 Today Tonight report by Richardson was found to have falsely portrayed him as having "fleeced" a dementia patient of $1 million.