I don't know whether this is the Lorenz they are referring to, but there was another Lorenz who worked in optics. http://en.wikipedia.org/wiki/Ludvig_Lorenz

In fact, there is a Lorentz-Lorenz equation. Somewhat more confusingly, when you study Maxwell's equations on a Lorentz background, it is often convenient to work in the Lorenz gauge.

The most famous Lorenz probably is the ethologist and Nobel laureate Konrad Lorenz. Another famous scientist is Edward Lorenz, who discovered the Lorenz attractor, which is often regarded as a starting point of chaos theory