He is currently Chairman of Kenya Airways, a position he has held since October 2016, and also chairs the Safaricom PLC board, having been appointed in August 2020.
He was until recently (October 2017) Vodafone's Director of Mobile Money and was responsible for leading the strategic growth and development of successful M-PESA proposition across the Vodafone footprint.
[citation needed] Joseph was the founding CEO of Safaricom Limited, steering the company from a subscriber base of less than 18,000 in 2000 to over 17 million subscribers at his retirement in November 2010 making it the most successful company in East Africa.
[citation needed] Joseph has been the recipient of many awards, including CEO of the year awarded by the Kenya Institute of Management, the Elder of the Order of the Burning Spear (awards given by the President of Kenya to those who have made a positive impact in Kenya).
He has extensive international experience in company start-ups, the implementation and operation of large wireless and wire-line networks.