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This week the Frick added three members to the board : John P. Birkelund , a former chairman and chief executive of Dillon Read & Company ; Walter A. Eberstadt , a limited managing director of Lazard Freres & Company ; and Stephen A. Schwarzman , chairman and chief executive of the Blackstone Group , an alternative asset management firm , of which he was a co-founder .
 person of company: Stephen A. Schwarzman, Blackstone Group; company founders: Blackstone Group, Stephen A. Schwarzman
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:  Stephen A. Schwarzman, Blackstone Group; Blackstone Group, Stephen A. Schwarzman 
Answer:
 person of company: Stephen A. Schwarzman, Blackstone Group; company founders: Blackstone Group, Stephen A. Schwarzman