Mobile phone maker HTC this morning announced a series of executive promotions and newly created management positions.

The Taiwanese company said it had poached two senior execs from rival Sony Ericsson and that it had promoted three others to its management team. Buried in the press release, however, is that a senior executive of its own has quit the company.

In a statement, HTC announced that it appointed Ron Louks as chief strategy officer, a new position that will oversee HTC’s strategic planning and technology development. Louks was previously CTO at Sony Ericsson. HTC also appointed Kouji Kodera as chief product officer, putting him in charge of the company’s global product planning and management. Kodera was also previously a senior executive at Sony Ericsson, where he was head of products also.

HTC added that it had promoted David Chen, previously vice president of product development and the second employee ever to have been hired by the company, to chief engineering officer.

Previously VP of HTC North America, Jason Mackenzie has been promoted to president of HTC North America and Latin America, while Florian Seiche has been promoted from VP to president of HTC EMEA.

As mentioned before, HTC has also lost a key senior executive. Jason Juang, formerly executive vice president at the company, has apparently quit to “pursue other opportunities”.

We’ll be very curious to find out where he’s headed next.

We’ve updated HTC’s CrunchBase profile to reflect the changes.