Dr Richard Marsh, the former director of education at Cathedral House, Canterbury Cathedral, takes up the post at the alliance this week. The coalition was formed in 2005 to improve public trust in charities.
Marsh's tasks will include increasing membership from ImpACT's current level of about 70 and securing new funds. He did not rule out the possibility that charities would be asked to pay to join, saying only that membership remained free "for the time being".
He is employed by the Institute of Fundraising, which declined to disclose his salary.
Marsh said he hoped existing ImpACT members would lead by example in the coalition's drive for transparency. "Those that are resisting will find that there is nothing to worry about - there will be benefits all round," he said.