Jean Le Marchant
Interesting, if rather overlooked, character, who reformed the British cavalry and set up the first British Staff College. I came across this lengthy YT video about him https://www.youtube.com/watch?v=eeuC-IpqJRA&t=1836s although I would disagree about the originality of the Light Cavalry sabre. A lot of British kit was copied from the Austrians after the Flanders campaign of 1793-4, including the Hungarian sabre and much of Sharpe's uniform. I can hear Zack saying "No, not more competition", but I have also come across this fairly new podcast, where a recent edition features Dr William Fletcher talking about Marchant and the British Staff in the Peninsular. https://goodpods.com/podcasts/the-history-syndicate-podcast-699044/15-re-evaluating-the-british-staff-contribution-to-the-napoleonic-wars-94797627 Although it is Anglocentric and repeats some mythology about the French staff (there was nothing unusual about the Marshals not knowing Napoleon's overall strategic concept in 1815 as it was always the case and the root of the 1806 near-debacle), Fletcher gives some due account to Austria and Prussian staff development.