API Constituent Details - Membership Information

Greetings-

I'm wondering if there is a call/method similar to SOAP GetConstituentInfoEx, but that can be invoked by passing in a constituent ID.... much like the REST call: CRM/Constituents/210752/Detail, which provides some basic data I'm looking for, but does not provide the deeper membership information like membership level description, expiration date, etc...

I'm assuming I MAY need a stored procedure to return this data... can anybody confirm that i'm on the right track by researching the ExecuteLocalProcedure method in the SOAP interface?

Thanks!

Jason