Looks like the documentation has expired, as there is no owner listed at
Office of Science and Technology
Vessel Name: TAZ
USCG Doc. No.: 667530
Vessel Service: RECREATIONAL
IMO Number: *
Trade Indicator: Recreational
Call Sign: *
Hull Material: FRP (FIBERGLASS)
Hull Number: *
Ship Builder: *
Year Built: 1983
Length (ft.): 29.9
Hailing Port: GALVESTON TX
Hull Depth (ft.): 5
Owner:
Hull Breadth (ft.): 10
Gross Tonnage: 7
Net Tonnage: 6
Documentation Issuance Date: August 29, 1996
Documentation Expiration Date: October 31, 1998
Previous Vessel Names: No Vessel Name Changes
Previous Vessel Owners: WILLIAM B JACKSON
My guess it probably an estate boat that's tied up in probate. Best option is to talk to your marina to see if they can send a message to who's paying the slip fees.