Anne McCaffrey is probably best know for her Pern Novels and Stories. On Pern, Man and Dragon work together to keep everyone safe from Thread Fall. The first two trilogies, The Dragon Rider Trilogy and The Harper Hall Trilogy take place at the same time and their stories intersect but are told from different viewpoints.
Anne McCaffrey has also written non-Pern novels as well. I enjoyed the Powers That Be trilogy, the Crystal Singer series, the Rowan series along with her other works.
The Worlds of Anne McCaffrey|