A former Citigroup rainmaker who was a driving force behind the US bank’s growth in European investment banking in the 1990s and 2000s before setting up his own advisory shop in 2012, has emerged in a key role on IHS and Markit’s tie-up to create “a global information powerhouse”.

The two financial information services companies said in a March 21 statement they had agreed an all-share merger of equals with an equity value of more than $13 billion, with M Klein and Company working as lead adviser to IHS, which is also taking advice from Goldman Sachs, and JP Morgan representing Markit.