Remembering Ralph Steinman.

As detailed in the Appreciation piece written by Carol Moberg, Ralph’s discovery and investigation of DCs constituted an enormous contribution to immunology. However, Ralph’s influence extended far beyond the strictly scientific. Below, some of Ralph’s closest colleagues and friends reflect on the long-lasting effects of his unwavering mentorship, enthusiasm, generosity, and friendship. Also in this issue is a Perspective, originally commissioned by Ralph and written by Robin Weiss and Peter Vogt. Ralph passed away before he could read this engaging piece, which celebrates the centennial of the publication in the of the Nobel Prize-winning work of Peyton Rous. In addition to their Nobel Prizes, Ralph and Peyton Rous shared the distinctions of being long-time leaders of Rockefeller laboratories and editors of this journal.