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In 2005 he co-wrote, along with Robert Allen, the book "Cracking the Millionaire Code" in which he highlights several self-made millionaires such as Bob Circosta, Michael Dell, Bill Gates, Alexander Graham Bell, Oprah Winfrey, and others, using them as examples of how to build wealth.
Adler continued to write both alone and with other partners, and composed a major 1958 hit in collaboration with Robert Allen: "Everybody Loves a Lover", as recorded by Doris Day.