After qualification, and on the recommendation of Babeş, the government awarded Marinescu a grant to undertake postgraduate training in
neurology under
Jean-Martin Charcot at the
Salpêtrière Hospital in
Paris, where he met
Pierre Marie,
Joseph Babinski, and
Fulgence Raymond. Later, he worked with
Carl Weigert in
Frankfurt and then with
Emil du Bois-Reymond in
Berlin. On the assignment of Pierre Marie, he lectured on the pathological anatomy of
acromegaly at the Berlin International Congress in 1890. After nine years abroad, Marinescu returned in 1897 to Bucharest, where he received his doctorate and began a new professorial department at Pantelimon Hospital which had been created for him. Shortly thereafter, in 1897, a chair of Clinical Neurology was created at the
University of Bucharest, in Colentina Hospital. He remained in this post for the next 41 years and is regarded as the founder of the Romanian School of Neurology. He was elected a titular member of the
Romanian Academy in 1905. Between July 1898 and 1901, Marinescu made the first science films in the world in his clinic in
Bucharest:
The walking troubles of organic hemiplegy (1898),
The walking troubles of organic paraplegies (1899),
A case of hysteric hemiplegy healed through hypnosis (1899),
The walking troubles of progressive locomotion ataxy (1900) and
Illnesses of the muscles (1901). All these short subjects have been preserved. The professor called his works "studies with the help of the cinematograph", and published the results, along with several consecutive frames, in issues of the magazine
La Semaine Médicale from
Paris, between 1899 and 1902. In 1924,
Auguste Lumière recognized the priority of professor Marinescu concerning the first science films: "I've seen your scientific reports about the usage of cinematograph in studies of nervous illnesses, when I was still receiving
La Semaine Médicale, but back then I had other concerns, which left me no spare time to begin biological studies. I must say I forgot those works and I am thankful to you that you reminded them to me. Unfortunately, not many scientists have followed your way." In 1935, he became the founding chairman of the Royal Romanian Society for Heredity and Eugenics, which sought to popularize
eugenics and promote forced sterilization. ==Legacy==