Born in Windlesham, Surrey, Slee first achieved industry recognition for directing the 1989 ACE Award-winning PBS documentary series, After the Warming.
He then directed a TLC series with Burke, called Connections 2. By 1997 he was at the forefront of large screen IMAX film making, directing Wildfire – Feel the Heat for the Discovery Channel, and The Legend of Loch Lomond.
In 2003 he co-wrote and directed BUGS 3D! – An IMAX 3D natural history drama. The film was a semi-finalist at the 2004 Oscars, and was awarded the GSTA Lifelong Learning Honor. In 2008 he directed the feature film Meerkat Manor: The Story Begins. Based on the Animal Planet television series, the film was selected for the Tribeca Film Festival.
In 2011 he began filming the IMAX 3D project Flight of the Butterflies. The film had its premiere on 24 September 2012, at the Smithsonian’s National Museum of Natural History in Washington, D.C.