He was then hired by Goldman Sachs (J. Aron Division) to fulfil the same role and became an MD in 1996. He assumed responsibility for the FICC Global Macro Trading Group and was made a partner at Goldman Sachs in 1998. In this capacity, Christian managed an international team of traders in London, New York and Hong Kong. He retired from this partnership in 2004.
In 2005 he launched macro fund Semper Macro LLP, which then managed over $1.25 billion. He returned substantial assets to investors in January 2011 and retired from managing outside funds. He has since been a guest lecturer at Imperial College London’s Business School, amongst others.