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The acquisitions this week and Apollo 's new $ 12 billion fund have catapulted Mr. Black , 55 , a former lieutenant of Michael R. Milken , into the upper echelons of private equity -- in a league with Henry R. Kravis of Kohlberg Kravis Roberts and Stephen A. Schwarzman of the Blackstone Group .
 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