James McKinney

About

James McKinney is an Associate Area Chair and Clinical Professor at the Robert H. Smith School of Business. He holds a Ph.D. with a major in Accounting and a minor in Econometrics from the University of Maryland. Dr. McKinney has several years of experience teaching auditing, financial accounting, business ethics, professional accounting research, accounting systems, and fraud accounting. He is a CPA and has worked in public accounting, including at the national auditing office of his firm, as well as in the internal audit department of a Fortune 500 company. Dr. McKinney is an award-winning author of accounting research, a teacher, and a faculty advisor for student organizations. He has served as President of the Academy of Accounting Historians, as an editor of one of its publications, as a Board member of the Maryland Association of CPAs, and as Chairman of the Global Accounting Digital Archive Network Project. His research primarily relates to accounting professionalization and organizational issues, both current and historic. He has presented his research at numerous national and international meetings of the American Accounting Association, the Academy of Accounting Historians, and the World Congress of Accounting Historians. He is a member of several professional organizations, including the American Accounting Association, the American Institute of Certified Public Accountants, ISACA, the Institute of Internal Auditors, the National Association of Black Accountants,…

Research topics

• Computer Science
• Philosophy
• Physics
• Mathematics
• Quantum mechanics
• Astrophysics
• Aesthetics
• Pure mathematics
• Theoretical computer science
• Optics

Selected publications

• Resolved magnetic-field structure and variability near the event horizon of Sagittarius A*

  Science · 2015-12-03 · 221 citations

  articleOpen access

  Near a black hole, differential rotation of a magnetized accretion disk is thought to produce an instability that amplifies weak magnetic fields, driving accretion and outflow. These magnetic fields would naturally give rise to the observed synchrotron emission in galaxy cores and to the formation of relativistic jets, but no observations to date have been able to resolve the expected horizon-scale magnetic-field structure. We report interferometric observations at 1.3-millimeter wavelength that…

  PublisherOA PDFDOI

• Radiative, two-temperature simulations of low-luminosity black hole accretion flows in general relativity

  Monthly Notices of the Royal Astronomical Society · 2016-12-01 · 130 citations

  articleOpen access

  We present a numerical method that evolves a two-temperature, magnetized, radiative, accretion flow around a black hole, within the framework of general relativistic radiation magnetohydrodynamics. As implemented in the code KORAL, the gas consists of two sub-componentsions and electrons -which share the same dynamics but experience independent, relativistically consistent, thermodynamical evolution. The electrons and ions are heated independently according to a prescription from the literature…

  PublisherOA PDFDOI

• Efficiency of thin magnetically arrested discs around black holes

  Monthly Notices of the Royal Astronomical Society · 2016-07-11 · 97 citations

  articleOpen access

  The radiative and jet efficiencies of thin magnetized accretion discs around black holes (BHs) are affected by BH spin and the presence of a magnetic field that, when strong, could lead to large deviations from Novikov-Thorne (NT) thin disc theory. To seek the maximum deviations, we perform general relativistic magnetohydrodynamic simulations of radiatively efficient thin (half-height <it>H</it> to radius <it>R</it> of <it>H</it>/<it>R</it> &ap…

  PublisherOA PDFDOI

• Efficiency of super-Eddington magnetically-arrested accretion

  Monthly Notices of the Royal Astronomical Society Letters · 2015-09-08 · 87 citations

  articleOpen access1st authorCorresponding

  Abstract The radiative efficiency of super-Eddington accreting black holes (BHs) is explored for magnetically-arrested discs, where magnetic flux builds-up to saturation near the BH. Our three-dimensional general relativistic radiation magnetohydrodynamic (GRRMHD) simulation of a spinning BH (spin a/M = 0.8) accreting at ∼50 times Eddington shows a total efficiency ∼50 per cent when time-averaged and total efficiency ≳ 100 per cent in moments. Magnetic compression by the magnetic flux near the r…

  PublisherOA PDFDOI

• X-ray polarimetry with the Polarization Spectroscopic Telescope Array (PolSTAR)

  Astroparticle Physics · 2015-11-03 · 57 citations

  articleOpen access
  PublisherOA PDFDOI

Recent grants

• Collaborative Research: Connecting 3D Simulations of Magnetized Disks and Jets with Direct Event Horizon Telescope Observations

  NSF · $458k · 2017–2020

Frequent coauthors

• Ramesh Narayan

  61 shared

• Alexander Tchekhovskoy

  41 shared

• Lixin Dai

  24 shared

• Charles F. Gammie

  University of Illinois Urbana-Champaign

  20 shared

• Roman Gold

  University of Southern Denmark

  19 shared

• Mark Avara

  University of Cambridge

  19 shared

• R. D. Blandford

  Kavli Institute for Particle Astrophysics and Cosmology

  18 shared

• Sheperd S. Doeleman

  17 shared

Awards & honors

• President of the Academy of Accounting Historians
• Editor of one of the publications of the Academy of Accounti…
• Board member of the Maryland Association of CPAs
• Chairman of Global Accounting Digital Archive Network Projec…

Similar researchers at University of Maryland, College Park

• Jingyi Qianh-46
• Lawrence A. Gordonh-38
• Xin Zhaoh-30