Rabbi yechiel nisselbaum shlita student of the chofetz chaim rav yisroel meir hakohen kagen
Meir HaKohen was a German Rabbinical scholar of the end of the thirteenth century. He authored Hagahot Maimuniot (or Haggahot Maimuniyyot) on Maimonides' Mishneh Torah. Bartolocci mistakenly identifies him with Meïr Ha-Kohen, a French scholar of the same century.
References
Meir HaKohen Wikipedia(Text) CC BY-SA