He held the position until the end of 1999. Gieschen’s winning percentage as a senior AFL coach finished at 52 percent. Gieschen served as the Umpires' National Umpire Manager Australian Football League for 14 years, until his resignation which took effect on 28 November 2013. Gieschen (with the now former Head of Coaching for umpires, Rowan Sawers) has been acknowledged by the AFL (memorandum from Mark Evans, AFL Football Operations Manager, 30 October 2013) as "...the longest serving umpire coach/manager combination in the history of the AFL. They have overseen a period of great improvement in the professionalism and advancement of umpiring programs and the outstanding performance of umpires and officials in Finals and Grand Finals." In his 14 years of managing the AFL's umpires Gieschen implemented a range of reforms which have included: stricter enforcement of the AFL's "abuse to umpires" policy; abolition of the white uniform as part of a conscious effort to eradicate the "white maggot" label previously applied to umpires; objective performance management criteria to ensure accurate ranking and appointment of umpires; introduced a DVD overviewing umpiring/laws of the game for umpires, clubs, media and fans; successfully recommended the implementation of taller goalposts to improve scoring accuracy; oversaw the introduction of the "score review system"; four boundary umpires to enable boundary umpires to keep up with the game; standardised fitness testing for umpires; player to umpire career pathway to encourage former players to take up umpiring roles; and the appointment of Chelsea Roffey, the first female umpire appointed to a final, including a grand final. Following his departure from the AFL, Gieschen plans to launch a sport consultancy business.