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Mr. Heekin has been in contract talks for several weeks with Sir Martin Sorrell , the chief executive of the WPP Group , the No. 2 agency company , to become the chairman and chief executive of Grey Worldwide in New York , part of the Grey Global Group unit of WPP .
 person of company: Martin Sorrell, WPP 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:  Martin Sorrell, WPP Group 
Answer:
 person of company: Martin Sorrell, WPP Group