Paul Ehrenfest

Born in Amsterdam, he was the son of Philip Kohnstamm, a professor of theoretical physics and a colleague of Albert Einstein, Paul Ehrenfest and other luminaries of the period who were regular visitors to the family home.

Max Kohnstamm obituary John Palmer 2010

He joined a campaign to raise money for Zionism, led by Chaim Weizmann (who would become Israel's first president), and sparred with physicists including Niels Bohr and Paul Ehrenfest about quantum theory — a man of physics and, equally, of world politics.

What Did Einstein Know, And When Did He Know It? 2009

Einstein, whose name is now synonymous with genius was a frequent guest lecturer at Leiden in the 1920s due to his friendship with physicist Paul Ehrenfest, among whose papers the manuscript was found.

Original Einstein Manuscript Discovered | Impact Lab 2005

Einstein, whose name is now synonymous with genius was a frequent guest lecturer at Leiden in the 1920s due to his friendship with physicist Paul Ehrenfest, among whose papers the manuscript was found.

Einstein Manuscript Surfaces 2005

However, argued Kuhn, Planck did not have in mind a genuine physical discontinuity of energies until 1908, which is after Albert Einstein and Paul Ehrenfest had themselves emphasized it in

Thomas Kuhn Bird, Alexander 2004

Here is how Einstein explained his change of perspective in a letter to Paul Ehrenfest of 26 December 1915, just a few weeks after the publication of the final, generally covariant formulation of the general theory of relativity:

Einstein's Philosophy of Science Howard, Don A. 2004

In the less kind words of Paul Ehrenfest, it was “a kind of intellectual jungle.”

Euclid’s Window Leonard Mlodinow 2001

In the less kind words of Paul Ehrenfest, it was “a kind of intellectual jungle.”

Euclid’s Window Leonard Mlodinow 2001

In the less kind words of Paul Ehrenfest, it was “a kind of intellectual jungle.”

Euclid’s Window Leonard Mlodinow 2001

We know this from a letter that Paul Ehrenfest wrote to Bohr in July 1931, after a visit with Einstein in Berlin.

Scientific Blogging 2009