Introduction: Shunyavada, also known as Madhyamaka, is a Buddhist philosophical school that emphasizes the concept of emptiness or shunyata. It is regarded as one of the most influential schools of Mahayana Buddhism. Nagarjuna, an Indian philosopher and scholar, is widely considered as the founder of Shunyavada.

Nagarjuna and his contributions:
Nagarjuna was born in South India around the 2nd century CE. He is known for his profound philosophical works, particularly the Mulamadhyamakakarika (Fundamental Verses on the Middle Way). Nagarjuna's teachings played a pivotal role in shaping the Madhyamaka school of thought.

Emptiness (Shunyata):
The concept of emptiness, or shunyata, is a central tenet of Nagarjuna's philosophy. According to Nagarjuna, all phenomena lack inherent existence or self-nature. He argued that everything is interdependent and empty of any inherent essence or independent reality.

Dependent Origination:
Nagarjuna's philosophy is deeply rooted in the concept of dependent origination. He explained that all phenomena arise dependently, through causes and conditions. Nothing exists independently or in isolation. This understanding of dependent origination leads to the realization of emptiness.

Middle Way:
Nagarjuna's philosophy is often referred to as the Middle Way because it avoids the extremes of eternalism and nihilism. He rejected the notions of inherent existence and complete non-existence, proposing a middle ground that transcends dualistic thinking.

Refutation of Views:
Nagarjuna extensively analyzed and refuted various philosophical views prevalent during his time. He employed a method of logical reasoning called "prajñaparamita" to deconstruct these views and establish the doctrine of emptiness.

Influence and Legacy:
Nagarjuna's teachings had a profound impact on the development of Mahayana Buddhism. His works inspired subsequent Buddhist scholars and philosophers, such as Chandrakirti and Shantideva. The Madhyamaka philosophy spread to various regions, including Tibet, China, and Japan, where it continues to be studied and practiced.

Conclusion:
Nagarjuna is widely regarded as the founder of Shunyavada or Madhyamaka, a significant Buddhist philosophical school. His profound insights into emptiness, dependent origination, and the Middle Way continue to be highly influential in Buddhism. Nagarjuna's contributions have shaped the understanding of reality and the path to liberation within the Mahayana tradition.