Mullite/alumina fibers (Nextel(TM) 720) have been rendered conductive for electrophoretic deposition (EPD) by coating with polypyrrole (Ppy) from an aqueous solution of pyrrole (Py). The polymer coating was characterized by thermogravimetric (TG) analysis, scanning electron microscopy (SEM), and conductivity measurements. The Ppy coating thickness is similar to0.1 mum and the fiber resistance 1-2 (kOmega/cm)/fiber tow. A maximum conductivity of similar to48 S/cm was achieved from a 0.005M pyrrole solution. A Nextel 720/Al2O3 Composite was synthesized using Ppy-coated fibers as the cathode in an EPD cell. The green and sintered microstructures of the resultant composites are reported.