Rainer has designed, built and run telecommunication and digital businesses for the last 20 years in mature and emerging markets. His experience spans start-ups and large public multinationals, in senior executive, CxO and non-executive board roles. At McKinsey, Rainer helped high-tech, banking and telco clients to embrace digital technologies, while at Deutsche Telekom he built and led DT’s core product portfolio across 14 European markets, serving 90 million customers and 30 million households. As Chief Product and Innovation Officer at Reliance Jio in India, Rainer was responsible for setting up Jio's business units and for leading the commercial launch program to acquire the initial 100 million customers in 170 days, soon to become the world’s largest data network and India’s leading digital services provider. Currently, as Group COO, Rainer is responsible for Dialog Axiata’s businesses, corporate strategy and M&A, driving the digital transformation of Sri Lanka’s leading telco, pay TV and digital services player into an analytics and data driven agile company. Passionate about technology, Rainer advises and invests in digital telco, analytics, fintech and blockchain companies. He serves as Non-Executive Director at rain, South Africa’s digital mobile network operator. He holds a doctoral degree (Dr. rer. nat.) in Physics from the University of Technology Munich and worked as a computation and neuroscience researcher at California Institute of Technology (Caltech) / USA.