Oracle’s top cloud executive Thomas Kurian resigned from the company less than a month after he announced he would take “extended time off.” According to the company’s SEC filing, Kurian is resigning as Oracle’s president of product development to “pursue other opportunities.”

Oracle has not yet announced who will take over his role, though the filing said that his responsibilities had been “reassigned to other senior executives in Oracle’s development organization.”

Kurian started working for Oracle in 1996 and was responsible for leading its transition to a cloud technology company. This transition, however, was not an easy one as Oracle struggled to keep up with other cloud computing giants including Microsoft Azure and Amazon Web Services (AWS).

While Oracle kept relatively quiet above the reasons for Kurian’s extended leave, Bloomberg reported that he had a falling out with Oracle’s Executive Chairman Larry Ellison over differences in opinion about the cloud business. Kurian reportedly wanted to make Oracle’s software more available on public cloud competitors like AWS and Azure.

Kurian wrote in an email regarding his leave, “I am so very proud of all that we have accomplished together and so grateful for having had the opportunity to help you on that journey [to the cloud].”

In its most recent earnings call with investors Oracle Co-CEO Mark Hurd said that the company expected Kurian to return.

Oracle’s cloud services failed to meet investor’s expectations following its first quarter fiscal 2019 earnings. The company reported total revenues for the quarter were $9.2 billion, up 1 percent year over year. Total cloud services and license support plus cloud license and on-premise license revenues were up 2 percent to $7.5 billion. Cloud services and license support revenues were $6.6 billion, while cloud license and on-premise license revenues were $867 million.