Tanner has been working in the field of Social Innovation for the last 20 years assisting private, public and not-for-profit organisations to build a more environmentally conscious, socially just and abundant world.

In Los Angeles, California Tanner served as Managing Partner in Phillips & Associates a management consulting practice and the Executive Director of LA Works, a volunteer action centre, which develops and implements community service projects. Upon arriving in Cape Town, in 1998, Tanner became the Director of Source Consulting, a management consulting firm whose clients included the Independent Development Trust, Paraffin Safety Association, Cape Metropolitan Council, and the Jazzart Dance Company to name a few.

In 2008, he formed Earth Capital a consulting and asset management firm focused on: assisting the private sector transition toward a more sustainable approach to business; incubating impact businesses; and managing a portfolio of impact investments. His clients and assets under management have included: Spier, Nando’s, Africa Centre, iShack, Biolytixs, African Roots, Biogreen, and Greencabs, Presently, he is both a Director in Earth Capital and a Partner in Impact Amplifier. He currently sits on several boards including: African Roots, Biolytix, GreenCabs and the Africa Centre. Tanner achieved a Bachelor of Arts degree at Vassar College in New York and a Masters of Business Administration from the Drucker School at the Claremont Graduate University, in California.