I admire the families who work across borders to share their family history. The effort requires not only good personal research but also communication skills. You have to stay organized- and not duplicate each other's efforts.
The Kahn family is just starting their work. Most members are based out of Canada or the United Kingdom, but their tree expands across most of Europe. Right now, the site functions around profile posts. Arthur Kahn, a native of Paris, is one of those profiled. A short biography provides his birth, death, and work information. If you're at all related, the site is worth a look.