Smart answer:

Your search for Who was ludwig wittgenstein returned the following results:

the most influential, and arguably the greatest, philosopher of the 20th century

Ludwig Wittgenstein was the most influential, and arguably the greatest, philosopher of the 20th century.

the most brilliant and influential philosopher of the Twentieth Century

Ludwig Wittgenstein was arguably the most brilliant and influential philosopher of the Twentieth Century.

Source:

perhaps the greatest philosopher of the 20th century

Ludwig Wittgenstein, perhaps the greatest philosopher of the 20th century, was astonished that there should be a world at all.

a student of Friedrich von Wieser

Ludwig Wittgenstein was a student of Friedrich von Wieser.

Source:

an influential Austrian-British philosopher

Ludwig Wittgenstein was an influential Austrian-British philosopher.

Source:

a famous Austrian-British philosopher

Ludwig Wittgenstein, born in 1889, was a famous Austrian-British philosopher.

Source:

a professor of philosophy at the University of Cambridge from 1939 until 1947

Ludwig Wittgenstein was a professor of philosophy at the University of Cambridge from 1939 until 1947.

Source:

a world-renowned Austrian-British philosopher

Ludwig Wittgenstein (1889–1951) was a world-renowned Austrian-British philosopher.

Source:

who taught at the University of Cambridge and is known as one of the most important philosophers of the 20th century

Ludwig Wittgenstein - 1889 - 1951 - was an Austrian-British philosopher who taught at the University of Cambridge and is known as one of the most important philosophers of the 20th century.

an Austrian-British philosopher of logic, mathematics, and language

Ludwig Wittgenstein was an Austrian-British philosopher of logic, mathematics, and language.