How to Cross Reference Company and People Tables for Personalized Emails

Hi, I'm trying to send out personalised emails based on tech stack but don't know how to do this as the tech stack is found on the company table, not the people table. Please can someone show me how to cross reference the people and companies tables? The tables I'm working off are : https://app.clay.com/workspaces/346206/tables/t_DaHmn8XcScwq/views/gv_HpU7yjZ4Kqdg and https://app.clay.com/workspaces/346206/tables/t_RsQdpXkCDrH2/views/gv_VH9VjXGBJkZm