As a member of the senior men's German national team, Jackel won the gold medal at the 1993 FIBA EuroBasket.

The son of German parents who had migrated to Canada, Jackel played college basketball at Simon Fraser University, from 1978 to 1982.

In December 1996, Jackel became the first player in the history of the Bundesliga to surpass the 10,000 career total points scored mark.

[5] Between 1984 and 1993, Jackel gained a total of 113 caps with the senior German men's national team, in which he averaged 19.2 points per game.

[7] At the 1993 FIBA EuroBasket, Jackel averaged 11 points a game, en route to helping Germany win the tournament's gold medal.