A person who is a guiding or inspiring figure, often one who sets an example for others.

मार्गदर्शक व्यक्ति

English Usage: Albert Einstein is often regarded as a leading light in the field of physics.

Hindi Usage: अल्बर्ट आइंस्टीन को भौतिकी के क्षेत्र में मार्गदर्शक व्यक्ति माना जाता है।