In 1986, he joined the writing staff of long-running soap opera Neighbours, for which he wrote at least seventeen episodes between 1986 and 1988. He followed this stint with scripts in 1989 for medical drama G.P. and American-produced Mission: Impossible, made in Australia with a number of Australian crew members.
Since 2000, Maier, while continuing to work extensively in television, has shifted to a production rather than a script-writing role.
The telemovies on which he has been listed as executive producer include My Husband My Killer (2001), Heroes' Mountain (2002), A Model Daughter: The Killing of Caroline Byrne (2009), Hawke (2010), and Underground: The Julian Assange Story (2012).
A daily television drama series set in the fictional Melbourne suburb of Erinsborough, Neighbours chronicles the lives of the residents of Ramsay Street. The series initially revolved around three families: the Ramsays (at number 24 Ramsay Street), the Robinsons (at number 26), and the Clarkes (at number 28). The scope of the series has since broadened to include new Ramsay Street familes.