My newest story in Asimov's Science Fiction, "Vox ex Machina," is a stand-alone tale that only exists because, in the real world, the guys who built the Philip K. Dick "android" lost the thing's head. Commence fiction.
My next story in the "Old Man" sequence, "Each in His Prison, Thinking of the Key," will appear in the April/May issue of Asimov's, which comes out in February. The previous stories in the sequence continue (for now) to be available via Amazon for Kindle and the Kindle app. (Here's hoping that once I write the fifth and final story, "The World Will Be the World Again," someone will assemble all five stories between two covers.)
Though the stories jump around chronologically, they should be read in the order in which they were written: "Helping Them Take the Old Man Down," "Clockworks," and "Unearthed," which take place in 2001/2, 1962, and 1925, respectively. The new story takes place in 2006. As for the final story . . . you'll see.