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At Citigroup , the less-than-stellar returns of the Smith Barney mutual funds -- combined with the asset management division 's negligible contribution to the company 's bottom line -- have prompted the chief executive , Charles O. Prince , and the chief operating officer , Robert B. Willumstad , to take a hard look at the asset management business over the last few months .
 person of company: Robert B. Willumstad, Citigroup
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 person of company: Robert B. Willumstad, Citigroup