Mt Whitney Zone Forums General Discussion Williamson to Whitney High Country Route

Here's a good trip report from Bob Burd on Williamson via George Creek:
https://www.snwburd.com/bob/trip_reports/williamson_3.html

I would recommend looking up GPX files for Trojan Peak on Peakbagger. You will quickly find a .gpx for Trojan Peak which shares the same beginning part through the George Creek drainage.