 Ramo-Wooldridge Corporation, later part of TRW, recruited him and he took a one-year sabbatical in 1953.A consultant to Ramo-Wooldridge, Mueller got involved in the review of radar designs and the Bell Labs radar for the Titan rocket (which was originally radio-guided).Mueller was peripherally involved with some of the developments of the inertial systems and generally began to help out wherever there was a problem.