Church & Missions Dr Robi Sonderegger and Leo Bigger: Conquering Giants By Dawn Seow February 24, 2015February 24, 2015 February 24, 2015February 24, 2015 Clinical psychologist Robi Sonderegger returned to City Harvest Church with ICF Zurich’s pastor, Leo Bigger, to share the experience of conquering a giant in the form of a mountain. 0 FacebookTwitterWhatsappTelegram