After an extensive search, the Nevada County Economic Resource Council has contracted with a new executive director, a committee member said. Robert Trent, founder of the business incubation organization Sierra Commons, was announced as the executive director during the nonprofit’s Thursday regular meeting. “After an exhaustive search, we offered the position to Robert Trent,” said Lisa Swarthout, a Grass Valley councilwoman, who sits on the ERC’s executive committee. “We feel Robert is very qualified to take over the role of executive director, and we look forward to working with him and having him continue the great work started under (former …