Who developed the Pahawh Hmong writing system?

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Hmong-Mien languages Distribution of Hmong-Mien language family in China and Southeast Asia.

The Pahawh Hmong writing system was developed between 1959 and 1971 in Laos by a native leader named Shong Lue Yang.1

He created and refined increasingly sophisticated versions of this script, which is structured around the "onset" (the initial consonant or consonant cluster) and the "rime" (the vowel or vowel cluster and any final consonant) of a syllable.1