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It sounds like you want to introduce your readers to one of your inspirations (since you said this person is connected to one of the characters in your book). This is sometimes done in a preface, ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/37768 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It sounds like you want to introduce your readers to one of your inspirations (since you said this person is connected to one of the characters in your book). This is sometimes done in a _preface_, as opposed to in the backmatter, and can help "set the stage" for the work that follows. An author's preface of a page or two is fairly common, though of course your publisher has the final say.