David Kelly, the chief global strategist at JPMorgan Asset Management, is skeptical of stocks.JPMorgan Asset ManagementA robust multi-year run for US stocks may have gone too far.David Kelly of JPMorgan Asset Management explained why he's not as hopeful now.Here are the biggest risks facing investors heading into 2025.This year's exceptionally strong market rally gained steam after Donald Trump prevailed in the presidential elections, though momentum has started to fade lately.David Kelly, the chief global strategist at JPMorgan Asset Management, isn't surprised at all."Rallies usually overdo it, as do corrections," Kelly told Business Insider in a recent interview.