Garreth is President of The Canada-Africa Chamber of Business. Garreth is a co-founder and former MD of Glenheim Venture Capital and has previously served in executive government as an elected official in Cape Town; heading economic development and securing a seat in Parliament. He has been a member of the board of the University of Cape Town and its University Research Committee.

His firm, Glenheim Venture Capital – forerunner to the Africa Foresight Fund – was named one of the top 25 Most Innovative Companies of 2017 by FastCompany SA and was profiled in an inaugural report of 15 success stories, by the Southern Africa Venture Capital and Private Equity Association (SAVCA).