HTC said that Todd Achilles, the chief of HTC USA resigned about one month ago. The handset maker is currently searching for a replacement for Achilles. HTC makes Windows Mobile-powered devices like the T-Mobile Dash. Achilles had joined HTC last year after a stint with T-Mobile USA, where he served as the carrier's director of handset product management.

For more on Achilles' departure:
- read this article from RCRNews