The term "Bickart points" is often used for the foci of the Steiner circumellipse of a triangle. Who was Bickart, and what was the first publication to use the term?
Sur l’hypocycloïde à trois rebroussements (1913) gives an early reference to L. Bickart (Revue de Mathématiques spéciales, 1908).
This reference says M. Bickart, but that "M." stands for "monsieur", the initial is "L."
Here is one paper by L. Bickart on this geometric topic.
I cannot quite recover the circumellipse construction from this paper, but the constructions seem sufficiently similar to support the conclusion that this is the right Bickart.