What's a post-modern Ethicist to do?

"The disturbingly post-modern implication is that there really is no particular core knowledge or central discipline that constitutes ethical expertise. There is no ultimate answer, no final authority to whom we might turn. Somehow, the answers, if there were any, would come from a discussion that incorporated philosophy, theology, law, medicine, sociology, and common sense in a strange and new amalgam. The ethicist might mix a little Kant, Mill, and Rawls, a little Anglo-American case law, some Christian, Muslim, and Jewish moral theology, a little quantitative sociology, a little ethnography, the results from a public-opinion poll, a little clinical experience, and some self-reflection. This solution, while often practically useful, is theoretically unsatisfying."
John D. Lantos, M.D.