People Timeline

Erwin Schrödinger was an Austrian theoretical physicist whose work formed the foundation of wave mechanics in quantum theory. In 1926, he formulated the famous Schrödinger equation, which describes how the quantum state of a physical system changes over time, earning him the 1933 Nobel Prize in Physics alongside Paul Dirac. Critical of certain interpretations of quantum theory, he devised the celebrated "Schrödinger's cat" thought experiment to illustrate the paradoxes of quantum superposition and entanglement. Schrödinger also explored the intersection of physics and biology; his influential 1944 book "What Is Life?" inspired key developments in early molecular biology and genetic research.

Albert Einstein was a German-born theoretical physicist whose groundbreaking theories transformed humanity's understanding of space, time, and energy. During his "miracle year" in 1905, Einstein published seminal papers on special relativity, the photoelectric effect, and Brownian motion, establishing the mass-energy equivalence equation E=mc². In 1915, he completed the theory of general relativity, proposing that gravity results from the curvature of spacetime caused by mass. Awarded the 1921 Nobel Prize in Physics primarily for his work on the photoelectric effect, Einstein later emigrated to the United States in 1933. Beyond physics, he was a dedicated advocate for global peace, disarmament, and humanitarian causes.

Lise Meitner was an Austrian-Swedish physicist who played a pivotal role in nuclear physics and the discovery of nuclear fission. Working closely with Otto Hahn for decades, Meitner co-discovered the element protactinium and led crucial experimental research in Berlin. Forced to flee Nazi Germany in 1938 due to her Jewish heritage, she continued her work from Sweden. In late 1938, alongside her nephew Otto Robert Frisch, Meitner provided the theoretical explanation and physical framework for nuclear fission, demonstrating how atomic nuclei split and release vast amounts of energy. Despite her essential contributions, she was omitted from the 1944 Nobel Prize, yet remained a passionate advocate for nuclear energy's peaceful application.

Max Planck was a German theoretical physicist widely recognized as the originator of quantum theory. In 1900, while seeking to explain black-body radiation, Planck proposed that energy is emitted or absorbed in discrete packets called quanta, rather than continuously. This radical hypothesis led to the formulation of Planck's constant, a fundamental physical constant that redefined the boundaries of physics. Awarded the 1918 Nobel Prize in Physics for his discovery of energy quanta, Planck served in prominent academic and institutional roles in Germany, including leadership within the Kaiser Wilhelm Society. His pioneering insight catalyzed a fundamental shift from classical physics to modern quantum mechanics.

Sigmund Freud was an Austrian neurologist who founded psychoanalysis, creating a revolutionary framework for understanding human psychology. He proposed that human behavior is deeply influenced by unconscious desires, repressed memories, and early childhood experiences. Freud introduced structural models of the mind—comprising the id, ego, and superego—and conceptualized defense mechanisms alongside the Oedipus complex. Major works such as "The Interpretation of Dreams" popularized dream analysis as a tool for exploring the psyche. Freud's clinical insights during and after World War I also influenced early studies on war neurosis. His theories profoundly reshaped psychiatry, clinical psychology, Western literature, art, and modern cultural thought.

Paul Ehrlich was a pioneering German physician, scientist, and Nobel laureate who revolutionized immunology and pharmacology. Known as a founding father of modern chemotherapy, Ehrlich developed innovative tissue-staining techniques that advanced hematology and introduced the "magic bullet" concept—the idea that targeted chemical compounds could destroy specific pathogens without harming host cells. In 1909, alongside Sahachiro Hata, he discovered Salvarsan, an effective chemical treatment for syphilis that transformed infectious disease management. His side-chain theory of immunity provided a foundation for modern immunology. Ehrlich's interdisciplinary research permanently altered medical science, establishing principles that continue to guide drug development and targeted therapeutic strategies.

World War I accelerated medical and scientific innovation under immense wartime pressure. Military necessity spurred groundbreaking developments in trauma surgery, antiseptics, blood transfusion techniques, and mobile X-ray units, while field ambulances significantly improved triage efficiency. At the same time, industrial-scale warfare drove rapid advancements in chemical engineering, resulting in the deployment of toxic poison gases on the Western Front alongside defensive technologies like gas masks. Psychiatrists also began recognizing shell shock as a psychological trauma rather than cowardice. These wartime breakthroughs fundamentally transformed emergency care, public health protocols, and industrial chemistry worldwide.

Nedeljko Čabrinović was a Bosnian Serb printer and political activist involved in the 1914 Sarajevo Incident. As a member of Young Bosnia connected to the Black Hand secret society, he participated in the conspiracy to assassinate Archduke Franz Ferdinand. On June 28, 1914, Čabrinović hurled a bomb at the Archduke's motorcade, but the device bounced off the vehicle and detonated behind it, injuring bystanders while leaving the royal couple unharmed. After failing to commit suicide with cyanide, he was arrested immediately. Found guilty of high treason, his age under twenty-one spared him the death penalty; he was sentenced to twenty years' imprisonment and died of tuberculosis at Theresienstadt in 1916.

Gavrilo Princip was a Bosnian Serb nationalist and student whose action precipitated World War I. Belonging to the Young Bosnia movement and supported by the Serbian secret society Black Hand, Princip sought to liberate South Slavs from Austro-Hungarian rule. On June 28, 1914, in Sarajevo, he fatally shot Archduke Franz Ferdinand and his wife Sophie. The assassination triggered the July Crisis, leading directly to Austria-Hungary declaring war on Serbia and activating global alliance systems. Arrested at the scene, Princip avoided execution because he was under twenty at the time of the crime; instead, he received a twenty-year sentence and died of tuberculosis at Theresienstadt in 1918.

Danilo Ilić was a Bosnian Serb teacher, journalist, and nationalist activist who served as a primary organizer of the 1914 Sarajevo Incident. Active in Young Bosnia and linked to the Serbian secret society known as the Black Hand, Ilić played a crucial logistics role by recruiting conspirators—including Gavrilo Princip, Nedeljko Čabrinović, and Trifko Grabež—and distributing weapons and bombs for the attack on Archduke Franz Ferdinand. Arrested shortly after the assassination, Ilić was tried for high treason and murder in Sarajevo. Because he was over twenty-one years old at the time of the offense, he was sentenced to death and executed by hanging on February 3, 1915.