Fox Business | Riverstone, Retired Energy Executive Get Billion-Dollar Check to Shop in Oil Patch Fox Business II, investors are hoping that Riverstone Holdings LLC, the energy-focused investment firm, can repeat the success of a similarly named entity it launched last year with another big-name oil executive. That blank-check company, led by Mark Papa, who ... Riverstone, Retired Energy Executive Raise Nearly $1 Billion to Shop in Oil Patch |