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In page Schindler's Ark:

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Keneally's meetings with Pfefferberg, research and interviews of Schindler's acquaintances are detailed in his 2007 book, Searching for Schindler: A Memoir. In October 1980, Keneally went into Pfefferberg's shop in Beverly Hills to ask about the price of briefcases. Learning that Keneally was a novelist, Pfefferberg showed him his extensive files on Schindler, kept in two cabinets in his back room.[2] After 50 minutes of entreaties, Pfefferberg was able to convince Keneally to write the book. Pfefferberg became an advisor, accompanying Keneally to Poland, where they visited Kraków and other sites associated with the Schindler story. Keneally dedicated Schindler's Ark to Pfefferberg: "who by zeal and persistence caused this book to be written."