sentences:  During his tenure at WGBH Johnson also collaborated with Alistair Cooke on various Public TV programs and, occasionally, recorded Cooke's "Letter From America" for later broadcast on the BBC.In the 1970s, Johnson participated in the WGBH Radio Drama Development Project and later studied radio drama production with Desmond Briscoe of the BBC Radiophonic Workshop at WHA in Madison, Wisconsin.As audio designer for WGBH Radio Drama projects, Johnson produced "Herakles" by Archibald MacLeish, an experimental radio drama in quadraphonic sound.