Colonel Henry Steel Olcott (2 August 1832 – 17 February 1907) was an American military officer, journalist, lawyer and the co-founder and first President of the [Theosophical Society]
Olcott was the first well-known American of European ancestry to make a formal conversion to Buddhism
https://en.wikipedia.org/wiki/Henry_Steel_Olcott
The society's initial objective was the "study and elucidation of Occultism, the Cabala etc."[6] After a few years Olcott and Blavatsky moved to India and established the International Headquarters at Adyar, in Madras (now Chennai). They were also interested in studying Eastern religions, and these were included in the Society's agenda.
https://en.wikipedia.org/wiki/Theosophical_Society
Lucifer was a monthly journal published from September, 1887, to August, 1897, in London.
Besides Mme. Blavatsky and Mabel Collins, other major contributors included Archibald Keightley, Anna Bonus Kingsford, H. S. Olcott…
https://theosophy.wiki/en/Lucifer_(periodical)