Take it from our mom, Rose-Mary Rumbley is a rock star among Dallas' senior set. Her lively speeches and informative neighborhood history tours are sellouts months in advance. Her breadth of knowledge about all things Dallas is spectacular. Historian, humorist, author and actress, Rumbley, who appeared in the movie Paper Moon, is this area's most in-demand public speaker. Making more than 300 appearances a year at church groups, community colleges, book review clubs, senior centers and business luncheons, Rumbley can make any subject fascinating. She speaks with authority on dozens of topics: Dallas parks, the history of Oak Cliff, old-time radio, vaudeville, Broadway shows, Sam Houston, Texas' small-town food festivals and many others. She's written a book, Century of Class, about the history of public education in Dallas, and wrote The Unauthorized History of Dallas for the city's 150th birthday in 1991. Always on the move, Rumbley recently completed a trip along Route 66, gathering material for another book. Forget retirement. Dr. Rumbley's always ready to rumble.