Jeffrey A. Fagan

About

Jeffrey A. Fagan is the Isidor and Seville Sulzbacher Professor of Law at Columbia Law School, where he has taught since 2001. He is a leading expert on policing, crime, gun control, and race, with scholarly research that influences public policy. His work includes significant scholarship on capital punishment, the legal socialization of adolescents, neighborhoods and crime, juvenile crime and punishment, and police practices. Fagan's research on the New York Police Department’s stop-and-frisk practices, which found that more than 30 percent of the stops were legally unjustified or questionable, was central to a 2013 federal court decision that declared the policy unconstitutional. In addition to his role at Columbia Law, he holds a position as Professor of Epidemiology at the Mailman School of Public Health and has served as a visiting professor at Yale Law School. His contributions to the field have been recognized through awards and fellowships from institutions such as the Russell Sage Foundation, the Robert Wood Johnson Foundation, and the Open Society Institute’s Soros Justice Fellowship. Fagan has served on various editorial boards, contributed expert testimony, and participated in national panels examining policing and criminal justice issues.

Research topics

• Materials science
• Nanotechnology
• Optoelectronics
• Genetics
• Mathematics
• Physics
• Electrical engineering
• Optics
• Biology
• Chemistry

Selected publications

• <i>(Invited)</i> Calibrating Chiroptical Response of Enantiomer-Sorted Single-Wall Carbon Nanotubes Using Hyperspectral Fluorescence Microscopy

  ECS Meeting Abstracts · 2025-07-11

  article

  Recent advancements in the sorting of SWCNTs have created a vast library of samples varying in diameter, roll-up angle, handedness and filling state. While this diversity is intriguing due to the rich choice of structure-dependent properties, many samples lack high enantiomeric purity hindering advanced applications such as next-generation electronics or biosensing [1]. Chiroptical spectroscopy, notably Electronic Circular Dichroism (ECD) or Raman optical activity (ROA), has emerged as a preferr…

  PublisherDOI

• <i>(Invited)</i> Does Nanotube Chirality Impact Charge Transfer and Transport?

  ECS Meeting Abstracts · 2025-07-11

  article

  Single-walled carbon nanotubes (SWCNTs) have a number of unique properties that are attractive for emerging opto-electronic technologies. Among these is chirality, an important property of both natural and synthetic systems. A chiral object is not superimposable with its mirror-image reflection, and an object has handedness if it exists as two enantiomers that can be viewed as “left-handed” and “right-handed” mirror-image pairs. In the past couple of decades, chirality has emerged as a potential…

  PublisherDOI

• Rapid Broadband Raman Excitation Mapping of Chirality-Pure Carbon Nanotubes

  ECS Meeting Abstracts · 2025-07-11

  articleSenior author

  Each chirality of SWCNT has its own set of optical absorption (OA) resonances in the visible and near infrared ( vis -NIR), and also has its own vibrational modes, some chirality-specific, many chirality-non-specific. These resonances and modes give rise to Raman scattering (RS) in the vis -NIR which is strongly laser wavelength dependent. The variation of the intensity of RS with incident laser energy for a given band is the (resonant) Raman excitation profile (REP). Importantly, each resonant…

  PublisherDOI

• Electrically Tunable Excitonic-Hyperbolicity in Chirality-Pure Carbon Nanotubes

  ArXiv.org · 2025-09-29

  preprintOpen access

  Metamaterials exhibiting hyperbolic dispersion enable unprecedented control over light-matter interactions, from sub-diffraction imaging to enhanced spontaneous emission. However, conventional plasmonic hyperbolic metamaterials suffer from limited tunability and lack intrinsic emission capabilities, constraining their utility for active photonic devices. Here, we demonstrate the first room-temperature, electrically tunable, excitonic hyperbolic metamaterial using aligned films of chirality-pure…

  PublisherOA PDFDOI

• Brief of Amici Curiae Professors of Constitutional and Criminal Law in Support of Petitioner (Whitton v. Dixon - 25-580)

  eYLS (Yale Law School) · 2025-12-01

  articleOpen access

  Brief in support of Petitioner. SUMMARY OF ARGUMENT: This Court has “consistently held that a conviction obtained by the knowing use of perjured testimony is fundamentally unfair” because it “involve[s] a corruption of the truth-seeking function of the trial process.” United States v. Agurs, 427 U.S. 97, 103–04 (1976). Here, the Eleventh Circuit acknowledged that the state committed a Giglio violation when it permitted a jailhouse informant to falsely testify at trial that he lacked a violent cr…

  PublisherOA PDF

Frequent coauthors

• Angela R. Hight Walker

  99 shared

• Ming Zheng

  72 shared

• Erik K. Hobbie

  North Dakota State University

  61 shared

• Tom R. Tyler

  58 shared

• Amanda Geller

  University of California, Irvine

  54 shared

• Elizabeth S. Piper

  University of Puget Sound

  38 shared

• Jason K. Streit

  UES (United States)

  38 shared

• Yu-Teh Cheng

  37 shared

Education

• Ph.D., Criminology

  Columbia University

  1983

• M.A., Sociology

  Columbia University

  1979

• B.A., Sociology

  University of California, Berkeley

  1976

Awards & honors

• National Associate, National Research Council and Institute…
• Fellow, Earl Warren Legal Institute, School of Law, Universi…
• Power of One Award, Racial Justice Award, Center on Race Cri…
• Lillie and Nathan Ackerman Lecture in Equality and Justice,…
• Fellow, Davenport College, Yale University

Similar researchers at Columbia University

• Charles F. Sabelh-60
• Petros C. Mavroidish-51
• Bernard E. Harcourth-46