He was the founder of gAyatrI parivar. He propagated gayatri worship among the masses.
What is his life story?
What were his main teachings ?
His life story can be found on official website of All World Gayatri Pariwar.
He worked not only for Gayatri worship but also for many other Gods/Goddesses, Yoga, Indian Sanskriti etc. I gave an exam named 'Bhartiya Sanskriti Gyan Pariksha' organised by All World Gayatri Pariwar in my school days and that syllabus covered from Lord Shri Rama to Swami Vivekananda.