Dr. Mitch received his B.A. in Physics, cum laude, from Gettysburg College in 1988. At Gettysburg he was a Presidential Scholar, received the Miller Freshman Prize in Physics, the Miller Senior Award in Physics, and graduated with departmental honors. Dr. Mitch received a Ph.D. in solid state and condensed matter physics from The Pennsylvania State University in 1994. His thesis was entitled "Raman Scattering Studies of Variably Ordered Cluster Systems" and his advisor was the late Professor Jeffrey S. Lannin. His work at Penn State involved using interference enhanced Raman scattering to study the vibrational and electronic properties of ultrathin films of materials, including bismuth clusters and alkali metal doped fullerenes. This work resulted in twenty published papers, including two Physical Review Letters, and five conference presentations, including an invited talk at the 1995 March meeting of the American Physical Society. Dr. Mitch was also the recipient of a David Duncan Fellowship at Penn State.
Dr. Mitch was a Summer Research Student in the Penn State Department of Physics in 1987, where he manufactured thin film optical multilayers for Raman scattering studies using RF sputtering and evaporation. He was a Teaching Assistant in the Penn State Department of Physics from 1988 to 1990, serving as an instructor of recitation and laboratory classes for undergraduate science and engineering majors. Dr. Mitch was a Research Assistant in the Penn State Department of Physics from 1989 to 1994, where he utilized interference enhanced Raman scattering and transmission electron microscopy to study finite size effects and coalescence and growth processes in bismuth clusters, as well as performed Raman scattering measurements on alkali-metal doped fullerene films, investigating electron-phonon coupling and disorder effects. Dr. Mitch was an Associate Research Scholar in the University of Maryland Department of Materials and Nuclear Engineering and NIST Ionizing Radiation Division from 1994 to 1998, where he and Dr. Lisa Karam developed techniques for encapsulation of radionuclides within fullerenes and photonuclear activation of the fullerene cage itself. Since 1998, Dr. Mitch has been a Physicist in the Dosimetry Group, Radiation Physics Division of the NIST Physical Measurement Laboratory. Research interests include calibration and characterization of low-energy and high-energy low-dose-rate photon-emitting and miniature x-ray tube-based high dose brachytherapy sources, including study of the spectra emergent from these sources, variations in anisotropy of source emissions, and the response of well-ionization chambers relative to NIST air-kerma strength standards. Since he started working at NIST, Dr. Mitch has delivered over thirty-five conference presentations and published over twenty papers. He has served as a research advisor to fifteen students in the Summer Undergraduate Research Fellowship (SURF) program. He also served as a faculty member of the 2009 American Association of Physicists in Medicine Summer School. Dr. Mitch has been the Leader of the Dosimetry Group in the Radiation Physics Division since 2010.
Dr. Mitch is a member of Sigma Xi, has been a member of the American Physical Society since 1989, and the American Association of Physicists in Medicine (AAPM) since 2000. He serves as a Senior Associate Editor on the Editorial Board of the journal Medical Physics. Dr. Mitch is a member of the AAPM Therapy Physics Committee, Brachytherapy Subcommittee, Calibration Laboratory Accreditation Subcommittee, Task Group 292 on Electronic Brachytherapy Dosimetry, and the Working Group on Brachytherapy Dosimetry. He participates as the NIST representative on assessment teams that ensure compliance of Accredited Dosimetry Calibration Laboratories with AAPM requirements. Dr. Mitch has served as the NIST delegate to the Consultative Committee for Ionizing Radiation Section I, CCRI(I), and is a member of the Council on Ionizing Radiation Measurements and Standards (CIRMS).
Dr. Mitch is a Fellow of the American Association of Physicists in Medicine (AAPM). He received the Department of Commerce Bronze Medal Award for Superior Federal Service in 2004. He, along with three of his NIST Physics Laboratory colleagues, received a Federal Laboratory Consortium Award for Excellence in Technology Transfer in 2000. Dr. Mitch also received a NIST Measurement Services award in 1999.