Exhibit 99.9
Consent to be Named as a Director
In connection with the filing by Passage Bio, Inc. of the Registration Statement on Form S-4 with the Securities and
Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named in the Registration Statement and any and all amendments and supplements thereto
as a member of the board of directors of Passage Bio, Inc. following the consummation of the merger with Remix Therapeutics, Inc., which will be renamed Remix Therapeutics, Inc. I also consent to the filing of this consent as an exhibit to such
Registration Statement and any amendments thereto.
Dated: July 20, 2026
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By:
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/s/ Peter G. Smith, Ph.D.
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Name:
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Peter G. Smith, Ph.D.
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