Bloomington-based Sierra Bravo Corporation announced Friday that Mike Derheim has been named CEO of the Web development firm, which has most recently been doing business as Nerdery Interactive Labs.

Derheim replaces Luke Bucklin, who founded the company in 2003 with Derheim and Mike Schmidt. Bucklin, 40, and three of his sons-14-year-old twins Nick and Nate, and 12-year-old Noah-were killed on October 25 in a plane crash in Wyoming while returning home to Minneapolis from vacation.

Most recently, Derheim served as the company's chief financial officer (CFO). Company spokesman Mark Malmberg said that a CFO replacement has not yet been named.

Bucklin also served as the company's president, but that position will not be filled. In a memo to employees, Derheim said that the company is not naming or seeking a new president. Instead, the company will move forward with a vision that Bucklin had-to make all employees of the company co-presidents.

“Luke's vision of co-presidents emerging from every corner of The Nerdery has already been realized,” Derheim wrote in the memo. “We've seen it in the great many of you, whether you glimpsed it or not. We need you to see yourself owning this leadership role, right now and from here forward.”

Nerdery Interactive Labs employs more than 100 people and is among the state's largest Web development and design companies based on its Web revenue, which totaled $8.6 million in 2009.