SELECT T1.donator_name FROM endowment AS T1 JOIN school AS T2 ON T1.school_id  =  T2.school_id WHERE T2.school_name  =  'Glenn' INTERSECT SELECT T1.donator_name FROM endowment AS T1 JOIN school AS T2 ON T1.school_id  =  T2.school_id WHERE T2.school_name  =  'Triton'
Show the names of donors who donated to both school "Glenn" and "Triton."
[Schema (values) (types)]: | school_finance |  School : school_id (text) , school_name (text) , location (text) , mascot (text) , enrollment (text) , ihsaa_class (number) , ihsaa_football_class (text) , county (text) | budget : school_id (text) , year (text) , budgeted (text) , total_budget_percent_budgeted (text) , invested (text) , total_budget_percent_invested (number) , budget_invested_percent (text) | endowment : endowment_id (text) , school_id (text) , donator_name (text) , amount (text);