Wheeler Chair at Perimeter Institute ;  Dirección General de Asuntos del Personal Académico-Universidad Nacional Autónoma de México (DGAPA-UNAM , projects  IN112417  and  IN112820 ); the  European Research Council   Synergy Grant  " BlackHoleCam: Imaging the Event Horizon of Black Holes " (grant  610058 ); the  Generalitat Valenciana postdoctoral  grant  APOSTD/2018/177  and  GenT Program  (project  CIDEGENT/2018/021 ); MICINN Research Project  PID2019-108995GB-C22 ; the  Gordon and Betty Moore Foundation  (grant  GBMF-3561 ); the  Istituto Nazionale di Fisica Nucleare (INFN) sezione di Napoli , iniziative specifiche TEONGRAV; the  International Max Planck Research School for Astronomy and Astrophysics at the Universities of Bonn and Cologne ;  Joint Princeton/Flatiron and Joint Columbia/ Flatiron Postdoctoral Fellowships , research at the  Flatiron Institute  is supported by the  Simons Foundation ; the  Japanese Government  (Monbukagakusho: MEXT) Scholarship; the  Japan Society for the Promotion of Science (JSPS)   Grant-in-Aid for JSPS Research Fellowship  ( JP17J08829 ); the  Key Research Program of Frontier Sciences, Chinese Academy of Sciences  (CAS, grants  QYZDJ-SSW-SLH057 ,  QYZDJSSW-SYS008 ,  ZDBS-LY-SLH011 ); the  Leverhulme Trust Early Career Research Fellowship ; the  Max-Planck-Gesellschaft (MPG) ; the  Max Planck Partner Group of the MPG  and the CAS; the  MEXT/JSPS KAKENHI  (grants  18KK0090 ,  JP18K13594 ,  JP18K03656 ,  JP18H03721 ,  18K03709 ,  18H01245 , 25120007); the  Malaysian Fundamental Research Grant Scheme  ( FRGS) FRGS/1/2019/STG02/UM/02/6 ; the  MIT International Science and Technology Initiatives (MISTI) Funds; the  Ministry of Science and Technology (MOST) of Taiwan  ( 105-2112-M-001-025-MY3 ,  106-2112-M-001-011 ,  106-2119-M-001-027 ,  107-2119-M-001-017 ,  107-2119-M-001-020 ,  107-2119-M-110-005 ,  108-2112-M-001-048 , and  109-2124-M-001-005 ); the  National Aeronautics and Space Administration  ( NASA, Fermi Guest Investigator  grant  80NSSC20K1567 ,  NASA   Astrophysics Theory Program  grant  80NSSC20K0527 ,  NASA   NuSTAR award   80NSSC20K0645 ); the  National Institute of Natural Sciences (NINS) of Japan ; the  National Key Research and Development Program of China  (grant  2016YFA0400704 ,  2016YFA0400702 ); the  National Science Foundation (NSF , grants  AST-0096454 ,  AST-0352953 ,  AST-0521233 ,  AST-0705062 ,  AST-0905844 ,  AST-0922984 ,  AST-1126433 ,  AST-1140030 ,  DGE-1144085 ,  1207704 ,  AST-1207730 ,  AST-1207752 ,  MRI-1228509 ,  OPP-1248097 ,  AST-1310896 ,  AST-1555365 , AST-1615796 ,  AST-1715061 ,  AST-1716327 ,  AST-1903847 , AST-2034306 ); the  Natural Science Foundation of China  (grants  11573051 ,  11633006 ,  11650110427 ,  10625314 ,  11721303 ,  11725312 ,  11933007 ,  11991052 ,  11991053 ); a fellowship of  China Postdoctoral Science Foundation  ( 2020M671266 ); the  Natural Sciences and Engineering Research Council of Canada (NSERC , including a  Discovery Grant  and the  NSERC   Alexander Graham Bell Canada Graduate Scholarships-Doctoral Program ); the  National Youth Thousand Talents Program of China ; the  National Research Foundation of Korea  (the Global PhD Fellowship Grant: grants  NRF-2015H1A2A1033752 ,  2015-R1D1A1A01056807 , the  Korea Research Fellowship Program :  NRF-2015H1D3A1066561 ,  Basic Research Support Grant   2019R1F1A1059721 ); the  Netherlands Organization for Scientific Research (NWO)   VICI award  (grant  639.