Gonzalo Ramirez is a skill trainer in Might and Magic VI: The Mandate of Heaven. He can be found in his house in Mist, and teaches expert spear.
His services cost 2000 gold, and the party member must have four ranks in spear first.
In addition, he sells membership to the Duelists' Edge guild for 50 gold. The guild teaches the party the basic bow, mace, shield, body building, and chain armor skills.