Riverstone Networks named Dan Middleton as its Vice President of Sales for North America. Middleton joins Riverstone after ten years with Nortel Networks where held a number of senior sales and marketing positions. Most recently, he served as a sales Vice President in Nortel's Europe/Middle East/Africa (EMEA) region, where he was responsible for expanding Nortel's IP Convergence Business. http://www.riverstonenet.com/