10 Corrupt Physicians Who Exploited Their Patients in Unthinkable Ways

Doctors are often regarded as society's most vital figures, yet history has witnessed its share of tragedies caused by rogue medical professionals. While many horrors exist in the world, few can compare to the shock of seeing healers transform into tormentors, pushing the boundaries of what we thought possible.

Here’s a compilation of the ten most notorious doctors ever documented—individuals you’d want to steer clear of in any emergency room.

10. Dr. Walter Freeman (1895 – 1972)

Walter Jackson Freeman II, an American physician and member of the American Psychiatric Association, stands out on our list. While he didn’t engage in outright criminal acts, his use of a highly controversial and archaic medical procedure—the lobotomy—caused harm to approximately 3,400 individuals.

Freeman’s method involved inserting a metal pick into the corner of each eye socket, moving it back and forth to sever connections to the brain’s pre-frontal cortex. This crude technique didn’t require a neurosurgeon or an operating room, and anesthesia was often omitted. Freeman even performed these procedures in his personal van, which he famously dubbed the 'lobotomobile.'

Dr. Freeman was eventually prohibited from performing surgeries after several of his patients died from brain hemorrhages.

9. Dr. Linda Burfield (1867 – 1938)

Dr. Linda Burfield insisted on being called 'Dr. Hazzard' by her patients—a peculiar demand that surprisingly went unquestioned. Despite lacking a formal medical degree, she managed a medical clinic and practiced as a licensed physician in Washington State, USA.

Her notoriety stems not just from the number of lives she took (officially 15, according to police records), but from the extreme and hazardous treatments she advocated. Burfield believed fasting could cure nearly every illness, from minor colds to cancer. She enforced a harsh regimen on her patients, limiting them to two bowls of tomato broth and one or two small oranges daily, sometimes for an entire month.

In 1912, she was convicted of manslaughter following the death of Claire Williamson, a wealthy British woman who weighed under 50 pounds at her passing. After serving a two-year prison sentence, Burfield reopened her clinic, rebranding it as a 'school of health,' where she continued to exploit desperate patients seeking miraculous healing through starvation.

Dr. Hazzard passed away in 1938 while attempting to cure herself using her own fasting methods.

8. Dr. Marcel Petiot (1897 – 1946)

Marcel Andre Henri Felix Petitot, a French serial killer, carried out his crimes during both World Wars. His inclusion on this list is justified by an estimated death toll of around 60 patients.

After being wounded and discharged during World War I, Petitot graduated from medical school and began working as an intern in a mental hospital—a controversial role, given his own history of mental illness diagnoses during the war. Later, he lured patients with forged credentials, building a strong reputation. However, his clinic became notorious for rumors of illegal abortions and overprescribing addictive medications.

Petitot’s first alleged victim was Louise Delaveau, the daughter of one of his elderly patients, with whom he had an affair. Delaveau vanished, and witnesses reported seeing Petitot loading a trunk into his car. Despite an investigation, her case was eventually dismissed as a runaway.

The reality of Dr. Petitot’s actions came to light when neighbors reported a foul odor and thick smoke pouring from his chimney. Concerned about a potential fire, police and firefighters entered his home, only to discover a coal stove in the basement burning human remains, which were also scattered across the floor. Petitot was later tried and executed by guillotine on May 25, 1946.

7. Dr. Michael Swango (born 1954)

Michael Swango, a former physician and U.S. Marine recruit, is a notorious serial killer linked to over 60 deaths. Like others on this list, his murderous actions were intertwined with his medical career.

Nurses working alongside Swango observed that seemingly healthy patients were dying under suspicious circumstances, often when he was on duty. One nurse witnessed him injecting a patient with an unknown substance, after which the patient fell critically ill. Additionally, colleagues noticed that whenever Swango handled coffee or food, several staff members would suddenly become violently sick. Swango was eventually convicted of poisoning patients and coworkers and sentenced to five years in prison.

However, Swango’s story didn’t end there. After his release, he forged documents to change his name to Dr. Daniel J. Adams and resumed his medical career. Predictably, patients and colleagues began dying under suspicious circumstances. When authorities reopened investigations, he fled to Zimbabwe to evade prosecution, where he once again practiced medicine.

Swango’s reign of terror finally ended in 2000 when he pleaded guilty to murder and fraud charges. He received three consecutive life sentences. During the trial, prosecutors revealed disturbing excerpts from Swango’s personal journal, detailing the pleasure he derived from his crimes.

6. Dr. Jayant Patel (born 1950)

Jayant Mukundray Patel stands out on this list as the only doctor whose actions, resulting in the deaths of 87 patients, were not driven by experiments, mental illness, or murderous intent. Instead, his downfall was due to extreme incompetence and a blatant disregard for hygiene.

Patel, an Indian surgeon who relocated to the U.S., faced allegations from colleagues in Portland, Oregon. They accused him of performing surgeries without authorization, operating on other surgeons’ patients, conducting unnecessary procedures, and causing severe injuries and fatalities.

In 2003, Patel moved to Australia, where his surgical practices were quickly criticized. Colleagues described his techniques as outdated and careless. Nurses reportedly hid patients from him when he was on duty. He earned the nickname 'Dr. Death' and was accused of falsifying medical records to conceal his mistakes.

Patel is connected to at least 87 deaths among the 1,202 patients he treated between 2003 and early 2005. Given his 20-year career, the true number of victims remains unknown. In 2010, he was charged with the unlawful killing of three patients and injuring a fourth. Despite pleading not guilty, he was convicted and sentenced to seven years in prison.

5. Dr. John Bodkin Adams (1899 – 1983)

John Bodkin Adams, a British physician, was a convicted fraudster and a suspected serial killer. Between 1946 and 1956, 160 of his patients died under suspicious circumstances, with nearly all leaving him money or valuable assets in their wills.

Adams specialized in anesthetics but was far from diligent. He gained a reputation for negligence, often falling asleep during surgeries, eating snacks, counting money, and even mixing up anesthetic gas tubes, causing patients to wake up mid-operation.

Despite his poor technical skills, Adams became England’s wealthiest doctor by 1956, largely due to the inheritances he received from his dying patients. Although he was tried multiple times, he was never convicted of any crimes. Prosecutors couldn’t prove his involvement in the suspicious deaths, but many believe he was a serial killer who escaped justice.

4. Dr. H.H. Holmes (1861 – 1896)

Herman Webster Mudgett, also known as Dr. Henry Howard Holmes, graduated from Michigan Medical School and is one of America’s earliest documented serial killers. Unlike most killers who operate in the shadows, Holmes took his crimes to another level by constructing a hotel specifically designed for murder.

His 'house of horrors' featured acid pits, gas-filled bedrooms, secret chutes, and even a stretching rack. Holmes primarily targeted female employees and hotel guests, subjecting them to torture before their deaths. Their bodies were then sent to the basement, where Holmes meticulously dissected them, removing flesh and turning their remains into skeletal models.

While the confirmed victim count stands at 27, investigators noted that many bodies in the basement were too dismembered or decomposed to identify accurately. Some estimates suggest over 200 people may have met their end in Holmes’ hotel.

3. Dr. Josef Mengele (1911 – 1979)

Josef Rudolf Mengele, infamously known as 'The Angel of Death,' tops our list not only for his staggering death toll but also for the horrific 'medical experiments' he conducted on concentration camp prisoners during World War II.

After graduating from Frankfurt Medical School, Mengele joined the army and later volunteered for the Waffen SS medical unit, where he gained recognition as a soldier. In 1943, he was promoted to Captain and assigned to Auschwitz-Birkenau, the notorious Nazi death camp, as its chief medical officer.

Mengele quickly began exploiting prisoners. He marked a line on the children’s block wall at 150 centimeters—those shorter were sent to the gas chambers. The remaining children became subjects for his experiments, particularly identical twins. He injected chemicals into their eyes to alter eye color, amputated limbs, and conducted sterilization and shock treatments on young girls.

Once experiments concluded, survivors were typically killed and dissected. Mengele escaped after the war, living in hiding in Germany before fleeing to South America. Despite being pursued as a Nazi war criminal, he evaded capture for the rest of his life.

2. Dr. Shiro Ishii (1892 – 1959)

Shiro Ishii was a Japanese microbiologist and lieutenant general in the Imperial Japanese Army, overseeing a biological warfare unit responsible for human experimentation and war crimes during the Second Sino-Japanese War.

After graduating from medical school in 1922, Ishii was stationed at the 1st Army Hospital and Army Medical School in Tokyo. However, it wasn’t until 1942 that he began his infamous human experiments as part of a secret military project. His victims, estimated in the tens of thousands, were primarily Chinese prisoners of war and civilians. Ishii referred to them as 'maruta' (logs), reflecting either his view of them as disposable objects or the cover story that the facility housed a sawmill.

His experiments included exposing victims to biological weapons, performing vivisections, forcing abortions, and simulating conditions like strokes, heart attacks, frostbite, and hypothermia. Despite his atrocities, Ishii was never prosecuted. He traded the data from his experiments to the United States in exchange for immunity.

1. Dr. Harold Shipman (1946 – 2004)

Harold Frederick Shipman, a British physician, is one of history’s most notorious serial killers, with over 250 deaths attributed to him.

After graduating from Leeds School of Medicine, Shipman became a trusted member of the British Medical Council. In 1993, he established his own practice. His crimes came to light in 1998 when a colleague raised concerns about the unusually high mortality rate among his patients. Investigations revealed that Shipman had been injecting lethal doses of diamorphine into his patients and falsifying their medical records to suggest they were terminally ill.

Although Shipman received 15 consecutive life sentences, his time in prison was short-lived. He took his own life in his cell in 2004.