He worked as an archaeologist before taking an unexpected leap into the music business, working as both a songwriter and producer receiving seven platinum and gold discs. In 1987 he moved with his family to Cornwall and became involved with Rob Poole, John Nelson and The Lost Gardens of Heligan. During his time at Heligan, Smit wrote a popular book about the project. about his work. Later he dreamt up and then created the Eden Project, near St Austell, an £80 million initiative to build two transparent biomes in an old china clay pit near the village of Bodelva. The biomes contain different eco-climates; rainforest and Mediterranean. The outside area is also described as a biome and features areas such as "Wild Cornwall". Eden aims to educate people about environmental matters and encourages a greater understanding and empathy with these matters. Smit raised the needed funds and was the driving force, pulling the team of people together to build what has been described as 'the eighth wonder of the world' ; the site design was by Nicholas Grimshaw. The Eden Project is said to have contributed over £1 billion into the Cornish economy. Smit's book about the creation of the Eden Project, 'Eden', was first published in 2001 and updated on the 10th anniversary of the opening in March 2011. It is the best-selling environment book of the century to date. Smit was appointed an honorary Commander of the Order of the British Empire in the 2002 New Year Honours and awarded the Kilgerran Award of the Foundation for Science and Technology in 2003. In 2006 he was awarded an honorary Doctor of Design degree by the University of the West of England "in recognition of his outstanding achievements in promoting the understanding and practise of the responsible management of the vital relationship between plants, people and resources, which have made a major contribution regionally, nationally and internationally to sustainable development, tourism, architecture and landscape architecture". Smit has been outspoken in his views on issues such as social enterprise and entrepreneurship. In a 2008 interview, he said:
Britain is crap at being entrepreneurial because it's a risk averse country, and the stigma of failure is so high that if you fail you're considered to be a loser. Entrepreneurism is a word that has been stolen by people who don't understand it. The truth is that people who are entrepreneurial take risks, and risk is something that is un-British, and if you're successful with it they'll hate you for it.
The National Portrait Gallery collection has two photographs of Tim Smit from 2002. In 2008, Smit agreed to sit for sculptor Jon Edgar in Fowey as part of his Environmental series, and a terracotta head exists.
