East Lampeter Township-based High Construction Co. is looking for a new leader.
The reason for his departure was not disclosed by the company.
"I am currently looking for my next career venture (or adventure)," Twomey said via email.
He had served in that capacity since 2005.
Jeff Sterner, president and COO of High Industries Inc., is overseeing the construction company until a new president is hired.
“We had begun the process of identifying a successor immediately upon that resignation,” Sterner said in a statement. “That is a process that unfolds over time. When we bring that process to conclusion and have a new president of High Construction Co. on board, we will make an appropriate announcement.”
Sterner was president of High Construction from 1997 to 2005.