The series of HDTV Workshops was initiated by Leonardo in 1986 and continued for 13 years. Subsequently organised by an International Steering Committee operating under Guidelines for Steering Committee Activities, last updated in 1993. Leonardo chaired the Steering Committee until 1994 when he left the committee. Eleven HDTV events were organised:
| No. | City | Country | Yr | Month/Days | Note |
| 1 | L'Aquila | IT | 1986 | 11/12-13 | |
| 2 | L'Aquila | IT | 1988 | 02/29-03/02 | |
| 3 | Torino | IT | 1989 | 08/29-31 | |
| 4 | Torino | IT | 1991 | 09/03-05 | |
| 5 | Kawasaki | JP | 1992 | 11/18-20 | |
| 6 | Ottawa, ON | CA | 1993 | 10/25-27 | |
| 7 | Torino | IT | 1994 | 10/26-28 | |
| 8 | Taipei | TW | 1995 | 11/15-17 | |
| 9 | Montreux | CH | 1997 | 06/10-11 | Call for papers |
| 10 | Seoul | KR | 1998 | 10/15-16 | Call for papers |
| 11 | Genève | CH | 1999 | 06/15-16 |