George Postolos has resigned as Astros president and CEO, the team announced in a news release today.

Postolos, who played a key role working with Astros owner Jim Crane and his group in the purchase of the team, had been the team president and CEO since November 2011. He worked for seven years with Crane to acquire a sports franchise.

“I am very proud of what Jim accomplished with my help – acquiring a major league franchise with a strong and diverse ownership group, developing and implementing a good plan for the team’s future, and assembling a first rate management team,” Postolos said in a statement. “I look forward to helping other investors pursue their objectives in sports knowing that Jim and the Astros organization are off to a great start and well positioned for future success.”

Postolos will be returning to his consulting practice advising investors on acquisitions and strategy in major league sports.

During his time with the team, Postolos spearheaded several changes within the organization, including the Astros overall rebranding process, which included new team uniforms, colors and logos. He was also a driving force behind the Astros’ stake in CSN Houston, a new television network that has struggled to get full distribution in its first year.

“We appreciate George’s hard work in the acquisition of the Astros and his commitment to the organization,” Crane said. “I’d also like to personally thank him for the assistance that he has provided to me over the last several years and wish him the best of luck in the future.”