Madhav Sadashivrao Golwalkar (19 February 1906 – 5 June 1973), popularly known as Guruji was the second Sarsanghchalak ("Chief") of the Rashtriya Swayamsevak Sangh (RSS). Golwalkar is considered one of the most influential and prominent figures among Rashtriya Swayamsevak Sangh by his followers. He was the first person to put forward the concept of a cultural nation called Hindu Rashtra which is believed to have evolved into the concept of the Akhand Bharat Theory, united nations for Bharatiyas. Golwalkar was one of the early Hindu nationalist thinkers in India. Golwalkar authored the book We, or Our Nationhood Defined. Bunch of Thoughts is a compilation of his speeches. Source: Wikipedia (en)