Walter Energy CEO resigns

TAMPA — The CEO of one of Tampa's largest companies resigned this week, as Keith Calder stepped down from his role with Walter Energy, the coal producer with $2.3 billion in 2010 pro forma revenues.

“I do believe Walter Energy has immense potential, and I am sure it will be realized. That said, it is now time for me to move on and pursue other interests,” Calder says in a prepared statement, citing “differences of opinion concerning management philosophy” as the driving force behind his resignation.

Joseph Leonard, who served as interim CEO from March 2010 to March 2011, will resume that role until a new permanent CEO is found.