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Robert B. Willumstad , who was Citigroup 's chief operating officer , left in September and is now a director at the American International Group .
 person of company: Robert B. Willumstad, Citigroup; person of company: Robert B. Willumstad, American International Group
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Robert B. Willumstad, Citigroup; Robert B. Willumstad, American International Group 
Answer:
 person of company: Robert B. Willumstad, Citigroup; person of company: Robert B. Willumstad, American International Group