Who was Logan Marshall? He wrote many books on disasters. Was his name Logan Marshall?

Logan Marshall wrote many books dealing with the Titanic disaster and later with the Lusitania. There are books on the Titanic from 1912 that are by Logan Marshall. But also there are books by Marshall Logan. I came to the understanding that Mr Logan or Marshall or whatever his name was. Was really quite an opportunist and made a lot of money is the disaster biz. I will study him more to learn more. But here are two of his books from 1912 and 1915 respectively. I have had some of his books as Marshall Logan, but do not anymore.