George Chen
· Assistant ProfessorCarnegie Mellon University · Heinz College
Active 2000–2007
About
George H. Chen is an Associate Professor at the Heinz College of Information Systems and Public Policy and an Affiliated Faculty member in the Machine Learning Department at Carnegie Mellon University. His research focuses on trustworthy machine learning methods for reasoning about time, particularly in health applications. He specializes in predicting time durations before critical events, known as 'time-to-event prediction' or 'survival analysis,' and analyzing time series data such as electronic health records and EEG data. His work aims to develop new methods for these time-related problems, emphasizing statistical guarantees and nonparametric approaches that operate under minimal assumptions on the data. Professor Chen has authored a book/monograph published in December 2024 in Foundations and Trends in Machine Learning, providing a self-contained introduction to deep learning methods for predicting time-to-event outcomes, targeted toward a machine learning audience. He has also contributed to the field by teaching tutorials on survival analysis at CHIL 2020 and SIGMETRICS 2021, and co-organized a survival analysis symposium as part of the 2023 AAAI Fall Symposium Series. Beyond his academic pursuits, he co-founded and advises CoolCrop, an AgriTech startup in India that provides cold storage solutions and market forecasts to farmers, serving over 9000 farmers across 7 states. His educational background includes a PhD in Electrical Engineering and Computer Science from MIT (June 2015), an SM in Electrical Engineering and Computer Science from MIT (June 2012), and a BS with dual majors in Electrical Engineering and Computer Sciences and in Engineering Mathematics and Statistics from UC Berkeley (May 2010). In spring 2026, he is teaching 'Unstructured Data Analytics' to public policy and information systems master's students at CMU.
Research topics
- Physics
- Particle physics
- Nuclear physics
- Algorithm
- Combinatorics
Selected publications
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2007-06-12 · 16 citations
articleOpen accessIn e + e -collisions recorded using the CLEO II.V detector we have studied the Cabibbo suppressed decay of D 0 → π + π -π 0 with the initial flavor of the D 0 tagged by the decay D * + → D 0 π + .We use the Dalitz-plot analysis technique to measure the resonant substructure in this final state and observe ρπ and non-resonant contributions by fitting for their amplitudes and relative phases.We describe the ππ S-wave with a K-matrix formalism and limit this contribution to the rate to be < 2.5% @ 95% confidence level, in contrast to the large rate observed in D + → π + π -π + decay.Using the amplitudes and phases from this analysis, we calculate an integrated CP asymmetry of 0.01 +0.09 -0.07 ± 0.05.
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2006-01-18 · 66 citations
articleOpen accessWe describe a search for $\ensuremath{\psi}(3770)$ decay to two-body non-$D\overline{D}$ final states in ${e}^{+}{e}^{\ensuremath{-}}$ data produced by the CESR collider and analyzed with the CLEO-c detector. Vector-pseudoscalar production ${\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{0}$, ${\ensuremath{\rho}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\ensuremath{\omega}{\ensuremath{\pi}}^{0}$, $\ensuremath{\phi}{\ensuremath{\pi}}^{0}$, $\ensuremath{\rho}\ensuremath{\eta}$, $\ensuremath{\omega}\ensuremath{\eta}$, $\ensuremath{\phi}\ensuremath{\eta}$, $\ensuremath{\rho}{\ensuremath{\eta}}^{\ensuremath{'}}$, $\ensuremath{\omega}{\ensuremath{\eta}}^{\ensuremath{'}}$, $\ensuremath{\phi}{\ensuremath{\eta}}^{\ensuremath{'}}$, ${K}^{*0}\overline{{K}^{0}}$, and ${K}^{*+}{K}^{\ensuremath{-}}$ is studied along with that of ${b}_{1}\ensuremath{\pi}$ (${b}_{1}^{0}{\ensuremath{\pi}}^{0}$ and ${b}_{1}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$) and ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$. The largest amount of disagreement between the expected rate for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}X$ and that for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}X$ at $\sqrt{s}=3.773\text{ }\mathrm{GeV}$ is found for $X=\ensuremath{\phi}\ensuremath{\eta}$, at an excess cross section of $(2.4\ifmmode\pm\else\textpm\fi{}0.6)\text{ }\mathrm{pb}$ [${\ensuremath{\Gamma}}_{\ensuremath{\phi}\ensuremath{\eta}}^{\ensuremath{\psi}(3770)}=(7.4\ifmmode\pm\else\textpm\fi{}1.6)\text{ }\mathrm{keV}$], and a suggestive suppression is seen for ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ and $\ensuremath{\rho}\ensuremath{\pi}$. We conclude with form factor determinations for $\ensuremath{\omega}{\ensuremath{\pi}}^{0}$, $\ensuremath{\rho}\ensuremath{\eta}$, and $\ensuremath{\rho}{\ensuremath{\eta}}^{\ensuremath{'}}$.
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2006-02-03 · 59 citations
articleOpen accessUsing data obtained with the CLEO III detector, running at the Cornell Electron Storage Ring (CESR), we report on a new study of exclusive radiative $\ensuremath{\Upsilon}(1\mathrm{S})$ decays into the final states $\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\ensuremath{\gamma}{K}^{+}{K}^{\ensuremath{-}}$, and $\ensuremath{\gamma}p\overline{p}$. We present branching ratio measurements for the decay modes $\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}{f}_{2}(1270)$, $\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}{f}_{2}^{\ensuremath{'}}(1525)$, and $\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}{K}^{+}{K}^{\ensuremath{-}}$; helicity production ratios for ${f}_{2}(1270)$ and ${f}_{2}^{\ensuremath{'}}(1525)$; upper limits for the decay $\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}{f}_{J}(2200)$, with ${f}_{J}(2220)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${K}^{+}{K}^{\ensuremath{-}}$, $p\overline{p}$; and an upper limit for the decay $\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}X(1860)$, with $X(1860)\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{p}$.
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2006-07-14 · 35 citations
articleOpen accessUsing data taken with the CLEO III detector at the Cornell Electron Storage Ring, we have investigated the direct photon spectrum in the decays $\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}gg$, $\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}gg$, $\ensuremath{\Upsilon}(3\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}gg$. The latter two of these are first measurements. Our analysis procedures differ from previous ones in the following ways: (a) background estimates (primarily from ${\ensuremath{\pi}}^{0}$ decays) are based on isospin symmetry rather than a determination of the ${\ensuremath{\pi}}^{0}$ spectrum, which permits measurement of the $\ensuremath{\Upsilon}(2\mathrm{S})$ and $\ensuremath{\Upsilon}(3\mathrm{S})$ direct photon spectra without explicit corrections for ${\ensuremath{\pi}}^{0}$ backgrounds from, e.g., ${\ensuremath{\chi}}_{bJ}$ states, (b) we estimate the branching fractions with a parametrized functional form (exponential) used for the background, and c) we use the high-statistics sample of $\ensuremath{\Upsilon}(2\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\Upsilon}(1\mathrm{S})$ to obtain a tagged sample of $\ensuremath{\Upsilon}(1\mathrm{S})\ensuremath{\rightarrow}\ensuremath{\gamma}+X$ events, for which there are no QED backgrounds. We determine values for the ratio of the inclusive direct photon decay rate to that of the dominant three-gluon decay $\ensuremath{\Upsilon}\ensuremath{\rightarrow}ggg\text{ }\text{ }({R}_{\ensuremath{\gamma}}=B(gg\ensuremath{\gamma})/B(ggg))$ to be ${R}_{\ensuremath{\gamma}}(1\mathrm{S})=(2.70\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.13\ifmmode\pm\else\textpm\fi{}0.24)%$, ${R}_{\ensuremath{\gamma}}(2\mathrm{S})=(3.18\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.22\ifmmode\pm\else\textpm\fi{}0.41)%$, and ${R}_{\ensuremath{\gamma}}(3\mathrm{S})=(2.72\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.32\ifmmode\pm\else\textpm\fi{}0.37)%$, where the errors shown are statistical, systematic, and theoretical model dependent, respectively. Given a value of ${Q}^{2}$, one can estimate a value for the strong coupling constant ${\ensuremath{\alpha}}_{s}({Q}^{2})$ from ${R}_{\ensuremath{\gamma}}$.
Physical Review Letters · 2006-03-08 · 63 citations
articleOpen accessWe measure the cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\mathrm{\text{hadrons}}$ at ${E}_{\mathrm{c}.\mathrm{m}.}=3773\text{ }\text{ }\mathrm{MeV}$ to be $(6.38\ifmmode\pm\else\textpm\fi{}{0.08}_{\ensuremath{-}0.30}^{+0.41})\text{ }\text{ }\mathrm{nb}$ using the CLEO detector at the CESR ${e}^{+}{e}^{\ensuremath{-}}$ collider. The difference between this and the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\psi}(3770)\ensuremath{\rightarrow}D\overline{D}$ cross section at the same energy is found to be $(\ensuremath{-}0.01\ifmmode\pm\else\textpm\fi{}{0.08}_{\ensuremath{-}0.30}^{+0.41})\text{ }\text{ }\mathrm{nb}$. With the observed total cross section, we extract ${\ensuremath{\Gamma}}_{ee}\mathbf{(}\ensuremath{\psi}(3770)\mathbf{)}=(0.204\ifmmode\pm\else\textpm\fi{}{0.003}_{\ensuremath{-}0.027}^{+0.041})\text{ }\text{ }\mathrm{keV}$. Uncertainties shown are statistical and systematic, respectively.
Physical Review Letters · 2006-01-27 · 28 citations
articleOpen accessUsing data collected at the $\ensuremath{\psi}(3770)$ resonance with the CLEO-c detector at the Cornell ${e}^{+}{e}^{\ensuremath{-}}$ storage ring, we present searches for 25 charmless decay modes of the $\ensuremath{\psi}(3770)$, mostly multibody final states. No evidence for charmless decays is found.
Physical Review Letters · 2006-01-18 · 26 citations
articleOpen accessUsing the CLEO detector at the Cornell Electron Storage Ring, we have observed the ${B}_{s}$ meson in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at the $\ensuremath{\Upsilon}(5S)$ resonance. We find 14 candidates consistent with ${B}_{s}$ decays into final states with a $J/\ensuremath{\psi}$ or a ${D}_{s}^{(*)\ensuremath{-}}$. The probability that we have observed a background fluctuation is less than $8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$. We have established that at the energy of the $\ensuremath{\Upsilon}(5S)$ resonance ${B}_{s}$ production proceeds predominantly through the creation of ${B}_{s}^{*}{\overline{B}}_{s}^{*}$ pairs. We find $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{B}_{s}^{*}{\overline{B}}_{s}^{*})=[{0.11}_{\ensuremath{-}0.03}^{+0.04}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.02(\mathrm{syst})]\text{ }\text{ }\mathrm{nb}$, and set the following limits: $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{B}_{s}{\overline{B}}_{s})/\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{B}_{s}^{*}{\overline{B}}_{s}^{*})<0.16$ and $[\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{B}_{s}{\overline{B}}_{s}^{*})+\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{B}_{s}^{*}{\overline{B}}_{s})]/\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{B}_{s}^{*}{\overline{B}}_{s}^{*})<0.16$ (90% C.L.). The mass of the ${B}_{s}^{*}$ meson is measured to be ${M}_{{B}_{s}^{*}}=[5.414\ifmmode\pm\else\textpm\fi{}0.001(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.003(\mathrm{syst})]\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.
Physical Review Letters · 2006-05-10 · 44 citations
articleOpen accessFrom ${e}^{+}{e}^{\ensuremath{-}}$ collision data acquired with the CLEO detector at the Cornell Electron Storage Ring, we observe the non-$D\overline{D}$ decay $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c1}$ with a statistical significance of 6.6 standard deviations, using the two-photon cascades to $J/\ensuremath{\psi}$ and $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$. We determine $\ensuremath{\sigma}\mathbf{(}{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\psi}(3770)\mathbf{)}\ifmmode\times\else\texttimes\fi{}\mathcal{B}\mathbf{(}\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c1}\mathbf{)}=(18.0\ifmmode\pm\else\textpm\fi{}3.3\ifmmode\pm\else\textpm\fi{}2.5)\text{ }\text{ }\mathrm{pb}$ and branching fraction $\mathcal{B}\mathbf{(}\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c1}\mathbf{)}=(2.8\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. We set 90% C.L. upper limits for the transition to ${\ensuremath{\chi}}_{c2}$ $({\ensuremath{\chi}}_{c0})$: $\ensuremath{\sigma}\ifmmode\times\else\texttimes\fi{}\mathcal{B}<5.7\text{ }\text{ }\mathrm{pb}$ ($<282\text{ }\text{ }\mathrm{pb}$) and $\mathcal{B}<0.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ ($<44\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$). We also determine $\ensuremath{\Gamma}\mathbf{(}\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c1}\mathbf{)}/\ensuremath{\Gamma}\mathbf{(}\ensuremath{\psi}(3770)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}\mathbf{)}=1.5\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.3$ ($>1.0$ at 90% C.L.), which bears upon the interpretation of $X(3872)$.
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2005-04-01 · 33 citations
articleOpen accessUsing the CLEO II.V detector observing ${e}^{+}{e}^{\ensuremath{-}}$ collisions at around 10.6 GeV we search for neutral $D$ mixing in semileptonic ${D}^{0}$ decays tagged in charged ${D}^{*}$ decays. Combining the results from the $Ke\ensuremath{\nu}$ and ${K}^{*}e\ensuremath{\nu}$ channels we find that the rate for $D$ mixing is less than 0.0078 at $90%$ C.L.
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · 2005-03-08 · 16 citations
articleOpen accessUsing data recorded by the CLEO III detector at the Cornell electron storage ring (CESR), we have made measurements of some properties of the ${\ensuremath{\Sigma}}_{c}^{*++}$ and ${\ensuremath{\Sigma}}_{c}^{*0}$ charmed baryons. In particular: $\ensuremath{\Gamma}({\ensuremath{\Sigma}}_{c}^{*++})={14.4}_{\ensuremath{-}1.5}^{+1.6}\ifmmode\pm\else\textpm\fi{}1.4\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$, $M({\ensuremath{\Sigma}}_{c}^{*++})\ensuremath{-}M({\ensuremath{\Lambda}}_{c}^{+})=231.5\ifmmode\pm\else\textpm\fi{}0.4\ifmmode\pm\else\textpm\fi{}0.3\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$, $\ensuremath{\Gamma}({\ensuremath{\Sigma}}_{c}^{*0})={16.6}_{\ensuremath{-}1.7}^{+1.9}\ifmmode\pm\else\textpm\fi{}1.4\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$,$M({\ensuremath{\Sigma}}_{c}^{*0})\ensuremath{-}M({\ensuremath{\Lambda}}_{c}^{+})=231.4\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.3\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$.
Frequent coauthors
- 95 shared
V. Savinov
- 92 shared
H. Schwarthoff
- 92 shared
R. Poling
University of Minnesota
- 92 shared
J. C. Wang
Wuhan University
- 92 shared
C. Sedlack
University of Illinois Urbana-Champaign
- 91 shared
R. Ehrlich
- 91 shared
B. I. Eisenstein
University of Illinois Urbana-Champaign
- 90 shared
D. Riley
University of New Mexico
Awards & honors
- MIT George Sprowls award for best thesis in computer science
- MIT's top teaching award for graduate students, the Goodwin…
- Resume-aware match score
- Save to shortlist
- AI-drafted outreach
See your match with George Chen
PhdFit ranks faculty by your research interests, methods, and publications — grounded in their actual work, not templates.
- Free to start
- No credit card
- 30-second signup