Abd Al-Husayn Amini

Shaykh ʿAbd al-Husayn Amini (Arabic: عبدالحسین امینی), known as 'Allama Amini the author of the well-known book al-Ghadir, was a Shi'a jurist, muhaddith, theologian, historian, codicologist and one of the great Shi'a scholars in the fourteenth/twentieth century. Besides writing numerous important scholarly works, he also established in the city of Najaf the Amir al-Mu'minin Library, which includes 70,000 manuscripts.

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Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 4 years ago

I think it is 110 sahabah and 84 tabi'un, although I could be missing some since it's a big book.

This website has an extensive resource on the hadith of ghadir which may be of interest: https://www.al-islam.org/ghadir/