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We present results of a 3 year monitoring campaign of the Seyfert 1 galaxyMarkarian 509, using X-ray data from the Rossi X-ray Timing Explorer (RXTE) andoptical data taken by the SMARTS consortium. Both light curves show significantvariations, and are strongly correlated with the optical flux leading the X-rayflux by 15 days. The X-ray power spectrum shows a steep high-frequency slope of-2.0, breaking to a slope of -1.0 at at timescale of 34 days. The lag fromoptical to X-ray emission is most likely caused by variations in the accretiondisk propagating inward.

Correlated X-ray and Optical Variability in Mkn 509