Wikipedia: Tokyo Subway Sarin Attack

Aum Shinrikyo was founded in 1984 as a yoga and meditation class, initially known as Oumu Shinsen no Kai (オウム神仙の会 "Aum Mountain Hermits’ Society"), by pharmacist Chizuo Matsumoto.

Later, Matsumoto changed his name to Shoko Asahara and masterminded the most deadly terrorist attack in Japanese history. Asahara was executed by hanging on July 6, 2018, at the Tokyo Detention House, 23 years after the sarin gas attack, along with six other cult members.

Building New York's Subway

“Morning and night the hordes of clerks and stenographers and business men who fill the offices of down-town New York have poured across Newspaper Row and City Hall Park with scarcely a glance at the labor progressing underfoot that is going to bring them so many minutes nearer their work in the morning, and at night so many minutes nearer their play.”

Train of Thought: On the 'Subway' Photographs

An essay drawn from the introduction of Davidson’s iconic book Subway, first published in 1986:

To prepare myself for the subway, I started a crash diet, a military fitness exercise program, and early every morning I jogged in the park. I knew I would need to train like an athlete to be physically able to carry my heavy camera equipment around in the subway for hours every day. Also, I thought that if anything was going to happen to me down there I wanted to be in good shape, or at least to believe that I was. Each morning I carefully packed my cameras, lenses, strobe light, filters, and accessories in a small, canvas camera bag. In my green safari jacket with its large pockets, I placed my police and subway passes, a few rolls of film, a subway map, a notebook, and a small, white, gold-trimmed wedding album containing pictures of people I’d already photographed in the subway. In my pants pocket I carried quarters for the people in the subway asking for money, change for the phone, and several tokens. I also carried a key case with additional identification and a few dollars tucked inside, a whistle, and a small Swiss Army knife that gave me a little added confidence. I had a clean handkerchief and a few Band-Aids in case I found myself bleeding.