From what I can gather The Sojourner, known as "Soj" by her close SL friends was a PhD in education when she suffered a series of strokes. If you google her name you can find books she wrote before her strokes. She worked with sufferers from brain truama before she had her own. She then found groups online with interests in rehabilitation from brain injury which led her to Second Life, where she became an official mentor.
It seems that back in her day there were few private islands but she convinced Linden Labs that she needed a safe place for people recovering from or living with brain trauma to be without griefers or other surprises. The Sojourner taught monthly lessons and helped people become comfortable in Second Life.
It was reported that she may have been the first to create an exhibition for non-profits in Second Life, the Dreams Fair, hosted on her own sim. The physical person behind The Sojourner, Karen Derk Gans, died of cardiac arrest in May 2008, months before I came to SL for the first time.
So how do I know about her? A friend invited me to a building contest he participated in on a sim called Dreams. He told me the story of "Soj" and shared his creation with me. Every month it seems there is a new building contest on this sim to support it's continued existence. The sim is home to building classes and support groups.
References:
http://gwynethllewelyn.net/2008/05/26/the-sojourners-last-voyage/
http://secondthoughts.typepad.com/second_thoughts/2008/06/a-sojourner-pas.html
http://otsecondlife.wordpress.com/2008/05/27/to-soj-goodbye-and-thank-you/
http://nwn.blogs.com/nwn/2008/05/sojourners-end.html#more
http://www.thesojournersdream.com/
https://carmenwiki.osu.edu/display/libraries/Physical+Diversity+and+Innovation
