The Hall of Fame pitcher led the Rangers organization to greener pastures, being a part of the teams back to back trips to the World Series in 2010 and 2011.
Here is the official statement from Ryan.
"This is the right time for me to step down from my role of overseeing the Rangers organization," Ryan said. "I am extremely proud of what this organization has accomplished. On the field, we have enjoyed great success at the Major League level. The fans have supported us in record numbers the last two years and we have been able to upgrade the ballpark and enhance the in-game experience to reward that loyalty.
"We have a group of talented and passionate employees who have helped make this success possible. This organization is in good hands. I am leaving with a lot of great memories from my tenure here and I know the organization will continue to thrive in the years to come."