Blackstone Energy Partners, an energy-focused private equity business, agreed to acquire a majority stake in Geosyntec, an environmental engineering and design consulting firm. Financial terms were not disclosed. “As demand for environmental engineering and consulting services continues to rise, we believe Geosyntec’s trusted reputation for quality and technical expertise makes the company exceptionally well positioned to further scale to meet this growing opportunity. We are excited to work with their experienced management team and highly accomplished engineers and scientists in the years ahead to help power their continued expansion,” Darius Sepassi, Blackstone Managing Director.