Step 1: Clarification of the Inquiry:
The query requires identifying the teacher of the globally acclaimed sitar artist, Pandit Ravi Shankar.
Step 2: Comprehensive Elaboration:
Pandit Ravi Shankar (1920-2012) stood as a preeminent figure in 20th-century Indian music. His mentor was the esteemed maestro and instructor, Ustad Allauddin Khan, associated with the Maihar Gharana. Ustad Allauddin Khan also instructed other renowned musicians, including Ustad Ali Akbar Khan (sarod) and Annapurna Devi (surbahar).
Step 3: Conclusive Response:
Ustad Allauddin Khan was the teacher of Pandit Ravi Shankar.