Realtor, GRI, SRES at Frank Howard Allen Realtors Past: Customer Service Supervisor/Mgr at Cellular One/ATT Wireless I specialize in residential real estate in Sonoma and Napa Counties. From first-time buyers to professional investors and everyone in between, my past clients... I specialize in residential real estate in Sonoma and Napa Counties. From first-time buyers to professional investors and everyone in between, my past clients will tell you that I keep their best interests front and center, one hundred percent of the time.