John Donovan, CEO of AT&T Communications, announced his intention to retire effective Oct. 1.

For the past two years, Donovan has led AT&T Inc.’s (NYSE:T) largest business unit, AT&T Communications, a global telecom leader serving 100 million mobile, broadband and pay-TV customers in the United States, and millions of business customers, including nearly all of the Fortune 1000.

“JD is a terrific leader and a tech visionary who helped drive AT&T’s leadership in connecting customers, from our 5G, fiber and FirstNet buildouts, to new products and platforms, to setting the global standard for software-defined networks,” said Randall Stephenson, AT&T’s chairman and CEO. “He led the way in encouraging his team to continuously innovate and develop their skill sets for the future. We greatly appreciate his many contributions to our company’s success and his untiring dedication to serving customers and making our communities better. JD is a good friend, and I wish him and his family all the best in the years ahead.”

“It’s been my honor to lead AT&T Communications during a period of unprecedented innovation and investment in new technology that is revolutionizing how people connect with their worlds,” said John Donovan. “All that we’ve accomplished is a credit to the talented women and men of AT&T, and their passion for serving our customers. I’m looking forward to the future – spending more time with my family and watching with pride as the AT&T team continues to set the pace for the industry.”

Donovan joined AT&T in 2008 as Chief Technology Officer, overseeing the company’s global technology direction and innovation road map. He was then promoted to AT&T’s Chief Strategy Officer and Group President—AT&T Technology and Operations, before being named CEO of AT&T Communications in July 2017.

AT&T will name a replacement for Donovan soon.