Tim's been in post since 2004, watching every twist and turn of the capital's political scene.
He revealed the fact that Ken Livingstone had three children by previous relationships, prompting his response that Londoners weren't shocked by anything "as long as it doesn't involve children, animals or vegetables."
He also broke the story of Livingstone's secret visit to Cuba, kicking off an inquiry into international travel at the GLA.
More recently, he exposed the lies of a senior aide to the mayor over an undeclared trip to Nigeria, which led to her resignation, and reported extensively on the controversy over the mayor's race adviser Lee Jasper.
Tim has presented the London Politics Show since its start - with a special interest in the issues of education, housing and regeneration.
He's got four children and lives in south west London.