Griffiths was made an assistant lecturer in economics at the LSE in 1965. He taught at
Regent College on biblical economics in 1979, and wrote ''The Creation of Wealth: A Christian's Case for Capitalism'' in 1984. He has been influenced in this area by
Rousas J. Rushdoony. Griffiths is a
fellow of
Sarum College and delivered the 2011 Niblett Memorial Lecture there on "A Christian Reflection on the Financial Crisis". He served as vice-chairman of
Goldman Sachs International. He said he was "not ashamed" of the bank's compensation plans. He also said the issue of banking compensation should not be thought about solely from a short-term perspective. He defended the bank's bonuses, Griffiths said the general public should "tolerate the inequality as a way to achieve greater prosperity for all", saying also that "we should not ... be ashamed of offering compensation in an internationally competitive market which ensures the bank businesses here and employs British people". He additionally serves as Co-Conference Host at the
St. Gallen Symposium, together with
Roshni Nadar and
Dominic Barton. ==Political career==