Adelphia Founder, Son Guilty A federal jury convicts John Rigas, the 79-year-old founder of Adelphia Communications, of securities fraud and conspiracy. His son Timothy was also found guilty. The two were accused of conspiring to hide more than $2 billion in debt from shareholders and diverting some $100 million to their personal use. Two co-defendants were found not guilty in the case. Hear NPR's Jim Zarroli.