Joel Steinberg was raised in the Bronx and Yonkers, New York in a Jewish family.^[1] After graduating from Fordham University in 1962,^[1] he attended New York University Law School, but was dropped in 1964, and joined the U.S. Air Force in the following year.^[1][2] Following his military career, he returned to law school, and was admitted to the bar in New York. Due to the ongoing Vietnam War, lawyers whose studies were interrupted by conscription were exempted from the bar exam requirement, if they met certain requirements.^[1][3][2]

Steinberg shared a Greenwich Village, Manhattan apartment at 14 West 10th St.^[4] with Lisa, Mitchell (a younger child, also illegally adopted), and his live-in partner, Hedda Nussbaum. Steinberg had reportedly been hired by a single mother named Michele Launders to locate a suitable adoptive family for Lisa, but he instead took the child home and raised her with Nussbaum. He never filed formal adoption papers, and the child was not legally adopted.^[5][6]

Steinberg was under the influence of crack cocaine when he hit Lisa on the head on November 1, 1987. After the attack, he left the apartment for a dinner appointment with a friend. When he returned, he refused to help the child and instead freebased cocaine for the next several hours. The following morning Lisa had stopped breathing, and Nussbaum dialed 9-1-1. After police arrived at the scene, Lisa was transported from the apartment to Saint Vincent's Hospital. The child remained in the hospital for three days, and died after being removed from life support. In addition to Steinberg's deadly assault of Lisa, Mitchell and Nussbaum both showed signs of physical abuse at his hands.

In exchange for testifying against Steinberg, Nussbaum was not prosecuted for events related to Lisa's death. Nussbaum was alone in the apartment with an unconscious and bleeding Lisa for over ten hours without seeking any medical attention for the girl. At Steinberg's twelve-week trial, his defense argued that Nussbaum's extensive injuries resulted from a consensual sadomasochistic relationship between the two defendants. Her attorneys claimed that Nussbaum's decision to stay with Steinberg, even though she was a victim of domestic violence, was a sign of battered woman syndrome.

In New York State at that time, first-degree murder applied only to those who killed police officers or had committed murder while already serving a sentence for a previous murder. The jury was unable to convict Steinberg on the more serious charge of second-degree murder, but it did convict him of the lesser charge of first-degree manslaughter. Judge Harold Rothwax subsequently sentenced Steinberg to the maximum penalty then available for that charge: 81⁄3 to 25 years in state prison.

On two occasions, Steinberg was denied discretionary parole, mainly because he never expressed remorse for the killing. However, on June 30, 2004, he was paroled under the state's "good time" law, which mandated the release of inmates who exhibited good behavior while incarcerated after having served two-thirds or more of the maximum possible sentence. New York State has since increased this ratio to six-sevenths of the maximum term for persons convicted of violent felonies. Steinberg had spent most of his imprisonment at New York State's supermax prison, the Southport Correctional Facility, presumably to prevent him from being attacked by other inmates.

After his release, Steinberg moved to Harlem, where he took up work in the construction industry. As of 2006, he maintained his innocence.^[7] Mitchell was reunited with his biological mother, Nicole Bridget Smigiel.

On January 16, 2007, the New York Supreme Court, Appellate Division (New York's intermediate appellate court) upheld a $15 million award against Steinberg to Michele Launders, Lisa's birth mother. In its opinion,^[8] the court rejected the position that Steinberg, who acted as his own attorney, put forth:

[F]or Steinberg to dismiss the 8 to 10 hours preceding Lisa's death as “at most, eight hours of pain and suffering,” or as he alternatively states, a “quick loss of consciousness” (emphasis supplied), demonstrates that he is as devoid of any empathy or human emotion now as he was almost 20 years ago when he stood trial for Lisa's homicide. As any parent and, no doubt, most adults who have taken trips with young children can attest, the oft-heard question, “are we there yet?” is a clear illustration that, the more anticipated an event or destination so, seemingly slower the passage of time in a child's mind. For Lisa, lying on a bathroom floor, her body aching from bruises of "varying ages," her brain swelling from Joel Steinberg's "staggering blow," those 8 to 10 hours so cavalierly dismissed by Steinberg must have seemed like eternity, as she waited and wondered when someone would come to comfort her, and help make the pain go away.^[8]

• Child abuse
• Domestic abuse
• Death of Nathaniel Craver
• Death of Hana Grace-Rose Williams
• Death of Lydia Schatz
• Murder of Victoria Climbié
• Murder of Dennis Jurgens

• Johnson, Joyce (1 April 1991). What Lisa knew: the truths and lies of the Steinberg case. Kensington Pub. Corp. ISBN 978-0-8217-3387-5. Retrieved 10 September 2011.