Amy Muska O'Brien was named director of social investing at TIAA-CREF, a new position. She will oversee social screening of the CREF Social Choice Account, act as liaison to participants and stakeholders in connection with the company's social- and community-focused investments and assist the company on socially responsible and community investing issues. Ms. O'Brien was director of corporate social responsibility of the $2.7 billion Pension Board of the United Church of Christ, New York, and assisted in similar shareholder activism for the church's $600 million foundation. The United Church of Christ fund will use an executive recruiting firm to search for a replacement, said Don Barnes, vice president, who will temporarily take over Ms. O'Brien's duties. Officials could chose between two recruiting firms by the end of the month, he added.