I. FIELD AND THERMIONIC EMISSION FUNDAMENTALS; A. A Note On Units; B. Free Electron Gas; C. Nearly Free Electron Gas; D. The Surface Barrier to Electron Emission; E. The Image Charge Approximation; II. THERMAL AND FIELD EMISSION; A. Current Density; B. Exactly Solvable Models; C. WKB "Area Under the Curve#x94; Models; D. Numerical Methods; E. The Thermal and Field Emission Equation; F. The Revised FN-RLD Equation and the inference of Work Function; from experimental data; G. Recent Revisions of the Standard Thermal an Field Models; H. The General Thermal-Field Equation; I. Thermal Emittance; III. PHOTOEMISSION; A. Background; B. Quantum Efficiency; C. The Probability of emission; D. Reflection and Penetration Depth; E. Conductivity; F. Scattering Rates; G. Scattering factor; H. Temperature of a Laser-illuminated Surface; I. Numerical Solution of the Coupled Thermal Equations; J. Revisions to the Modified Fowler Dubridge Model: Quantum Effects; K. Quantum Efficiency Revisited: A Moments-based Approach; L. The Quantum Efficiency of Bare Metals; M. The Emittance and Brightness of Photocathodes; IV. LOW WORK FUNCTION COATINGS AND ENHANCED EMISSION; A. Some History; B. A Simple Model of a Low Work Function Coating; C. A Less Simple Model of the Low Work Function Coating; D. The (Modified) Gyftopoulos-Levine Model of Work Function; Reduction; E. Comparison of the Modified Gyftopoulos-Levine Model to; Thermionic Data; F. Comparison of the Modified Gyftopoulos-Levine Model to; Photoemission Data; V. APPENDICES; A. Integrals related to Fermi-Dirac and Bose-Einstein Statistics; B. The Riemann Zeta function