However, Lichtenberg was not a professional philosopher, and had no need to present, or to have, any consistent philosophy.

The Institute's membership includes both professional philosophers and lay people.

If anybody does find this book difficult, it is more likely to be the professional philosophers of science than interested amateurs.

He grew angry when any of his students wanted to become professional philosophers.

This led to his transformation, and upon being released from incarceration he became a professional philosopher.

But I think for our purposes we might define 'an ordinary person' as 'anyone who is not a professional philosopher'.

The membership of the association is restricted to professional philosophers, institutions, and learned societies.

This is a more direct study of existentialism by a professional philosopher.

Held over six days, this conference is designed to give professional philosophers the opportunity to present and discuss papers in all areas of philosophy.

John Dupré (born 1952) is a professional philosopher of science.