T-Mobile USA’s German parent, telecommunications biggie Deutsche Telekom AG, revealed in a Wednesday announcement that the US wireless carrier’s CEO Philipp Humm was leaving the company after a two-year stint at the helm.

In its announcement, Deutsche Telekom also said that T-Mobile’s Chief Operating Officer Jim Alling will take over as interim CEO after Humm’s departure; and that the carrier is already looking for a successor to Humm.

About Humm’s reasons for leaving the company, T-Mobile said that Humm would likely be pursuing a job outside of Deutsche Telekom so as to be together with his family, which stayed back in Europe. As per some media reports, he will probably take a job with an unnamed Deutsche Telekom competitor in Europe.

Humm joined Deutsche Telekom in 2005, and he initially shouldered the responsibility for the company's mobile business in Germany. He later took on the task of managing the sales and service activities of the European mobile companies within Deutsche Telekom Group, in 2008. However, in May 2010, Humm shifted to T-Mobile USA, and took over the reins as the company’s CEO in November 2010.

Acknowledging Humm’s contribution in giving the company “some important initiatives over the past years,” Deutsche Telekom CEO Renà Obermann elaborated: “Under his leadership the cost situation at T-Mobile USA has vastly improved and he led the company during a difficult phase regarding the planned merger with AT&T."