Alexander Aikens rejoined the $32.5 billion Massachusetts Pension Reserves Investment Management Board, Boston. Mr. Aikens, who was appointed by state Treasurer Timothy Cahill, will serve until Sept. 27, 2005, completing the term of David Grain. Mr. Grain will remain on the investment committee, but he stepped down from the nine-member board because of business obligations. Mr. Aikens previously served on the PRIM Board as a gubernatorial appointee from 2001 until his term expired earlier this year. He is an adjunct professor at Brandeis University, Waltham, Mass.