Ian Jones was named president and CEO of Marco Consulting Group, and Catherine Wenskus was named COO. Mr. Jones and Ms. Wenskus will be responsible for day-to-day operations of the firm, replacing Jack Marco and Thomas Mitchell, who co-founded the investment consultant to Taft-Hartley plans in 1988. Mr. Marco, who was president and chairman of the board, will remain chairman; and Mr. Mitchell, who was executive vice president and vice chairman of the board, will stay on as vice chairman, said Mary Erickson, Marco spokeswoman. Mr. Jones was senior consultant at Marco. Ms. Wenskus was deputy administrator of trust funds for the $257 million Teamsters Local 703 defined benefit plan, Chicago.