Michael K. Pratt has been appointed president and CEO of Aperto Networks. a Milpitas, Calif., developer of WiMax base stations and subscriber units for wireless and broadband service providers. He replaces Apertos' founder, Reza Ahy, who will remain chairman of the board. Mike was formerly president of ADC's Active Infrastructure unit and was previously executive vice president, Worldwide Access/Broadband Systems, at Marconi. He has also held executive and managerial positions at Reltec, DSC and Bell Labs.