JAVA J2EE 4 U

SELECT 

    p.proname AS function_name,

    r.rolname AS owner_name

FROM 

    pg_proc p

JOIN 

    pg_roles r ON p.proowner = r.oid

WHERE 

    p.proname = 'my_function';

SELECT 

    p.proname AS function_name,

    r.rolname AS owner_name

FROM 

    pg_proc p

JOIN 

    pg_roles r ON p.proowner = r.oid

WHERE 

    p.proname = 'your_function_name';