Short answers, pulled from the story.
In his 1924 thesis Recherches sur la théorie des quanta, de Broglie postulated that all matter has wave properties. He proposed that any moving particle has an associated wave whose wavelength equals the Planck constant divided by the particle's momentum, a concept now known as the de Broglie hypothesis.
De Broglie won the Nobel Prize in Physics in 1929 for his discovery of the wave nature of electrons. The prize followed experimental confirmation of matter's wave-like behavior in 1927 by George Paget Thomson in the United Kingdom and by Clinton Davisson and Lester Germer in the United States.
The de Broglie-Bohm theory is a causal interpretation of quantum mechanics built around the pilot-wave concept. De Broglie first proposed the pilot-wave idea at the 1927 Solvay Conferences, then abandoned it. David Bohm revived and developed it in 1952, and de Broglie revisited the framework in 1956, incorporating ideas from Bohm and Jean-Pierre Vigier.
De Broglie was the first high-level scientist to call publicly for the establishment of a multinational scientific laboratory. That proposal contributed directly to the founding of the European Organization for Nuclear Research, known as CERN.
De Broglie received his first degree in history in 1910 and initially intended a career in the humanities. He then turned to science and earned a science degree in 1913. His wartime work on radio communications at the Eiffel Tower, arranged by his brother Maurice, deepened his engagement with physics before he returned to fundamental research after his demobilization in August 1919.
UNESCO awarded de Broglie the inaugural Kalinga Prize in 1952 in recognition of his work popularizing scientific knowledge through his many scientific articles and publications. He was also honorary president of the French Association of Science Writers.