Magner , who is 54 and known as Marge , has been the consumer group 's chief operating officer since April 2002 , and sits on Citigroup 's management committee .
She has been the consumer unit 's chief operating officer since April 2002 , and sits on Citigroup 's management committee .
The vice president of grid computing strategy at IBM Corp., Dan Powers, says he is not worried about commodity PC clusters diminishing sales of traditional supercomputers.