C. J. Pascoe writes that which queer theorist challenges that gender is natural by claiming that gender is performed through "a set of repeated acts within a highly rigid regulatory frame that congeal over time to produce the appearance of substance, of a natural sort of being"?

The queer theorist goes by Judith Butler.

Explanation:

Judith Butler remains one of the critical writers and influentials in the field of Queer Studies. In his book, Gender Trouble: Feminism and subversion of identity, and several of his writings, Butler challenges that gender is natural by claiming that gender is performed through a set of repeated actions within a highly rigid regulatory frame that congeal over time to produce the appearance of substance of a natural sort of being.

With this foremost interventionism, Butler lays the foundation of providing requisite perspective into gender issues, feminism, and other controversial gender specific issues - gay, homosexuality, and et al.

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