Jonathan began his career in 1982 as Founder and Managing Director of The Amethyst Corporation, a Chicago consultancy. In 1990 he joined McKinsey and Company, the global consulting firm, in its London office. He became a partner there, eventually leading the firm’s organisation practice in Europe and advising clients, at boardroom level, in oil and gas, metals and mining, financial services and other industries. He joined Monitor Group in 2004, where he led the EMEA practices in Organization Strategy and National Economic Development and Security. In 2008, he joined Heidrick & Struggles, the search and leadership advisory firm, where he led the Education and Social Enterprise practice across EMEA and played a significant role in the CEO/Board and Leadership Consulting practices. He joined Tapestry Networks in 2012, first as an advisor and subsequently as head of the firm. He co-founded Eightwell, a Swiss co-operative (Verein) that brings together advisors in senior leadership consulting.
乔纳森一直是董事会成员，董事会主席和顾问的一些非营利性组织，最近包括安装路灯耶稣会中心，在伦敦一个成人的信念形成中心和圣母无原罪教堂教区（农场街道教堂），在菲儿耶稣会教堂。他一直在卡内基 - 梅隆大学，在那里他是一个客座教授的邀请讲师，并在斯坦福大学，欧洲工商管理学院，麻省理工学院和伦敦商学院。