Bloomberg Opinion columnist Barry Ritholtz interviews Jeremy Grantham, who co-founded the global asset management firm GMO and serves as its chief investment strategist. Prior to founding GMO, Grantham was co-founder of Batterymarch Financial Management, where he recommended commercial indexing; he began his investment career as an economist with Royal Dutch Shell. He and his wife Hannelore have established the Grantham Foundation for the Protection of the Environment.