Jane Mendillo was named chief investment officer for the $1.2 billion endowment of Wellesley College, Wellesley, Mass., effective Feb. 1, said Lulu Wang, chairwoman of Wellesleys investment committee. She will replace Catherine Feddersen, who retired. Ms. Mendillo is vice president for external management at Harvard Management Co., which manages the $19 billion endowment for Harvard University, Boston. Harvard is conducting a national search to replace Ms. Mendillo, sources said. Jack Meyer, CEO at Harvard Management, did not return phone calls by deadline.