This should help:
SELECT sc.name AS schema_name,
dbp.name AS owning_database_principal_name,
srp.name AS owning_server_principal_name
FROM sys.schemas AS sc
INNER JOIN sys.database_principals AS dbp
ON sc.principal_id = dbp.principal_id
INNER JOIN sys.server_principals AS srp
ON srp.sid = dbp.sid