News Links Videos Photos Events Donate Mattie J.T. Stepanek 2002 MDA National Goodwill Ambassador Mattie's powerful spirit and incredible accomplishments made him a natural for selection as MDA's National Goodwill Ambassador in 2002. Mattie, who is affected by mitochondrial myopathy, came to national attention with an appearance on the 2001 Jerry Lewis MDA Telethon on Labor Day weekend, in which ...