4th Nassau Mössbauer symposium analysis and summary -- Scientific legacy of Stanley Ruby -- Mössbauer spectroscopy methodology at the cutting-edge of high-pressure research -- Vibrational dynamics of Fe in amorphous Fe-Sc and Fe-Al alloy thin films -- Nuclear Resonance Vibrational Spectroscopy (NRVS) of Fe-S model compounds, Fe-S proteins, and nitrogenase -- On Spin Hamiltonian fits to Mössbauer spectra of high-spin Fe(II) porphyrinate systems -- Mössbauer effect of 151Eu in europium salen complex nanoparticles -- Velocity scales for Mars Mössbauer data -- Nanowires of iron oxides embedded in SiO2 templates -- Nuclear forward scattering vs. conventional Mössbauer studies of atomically tailored Eu-based materials -- A complete solution to the Mössbauer problem, all in one place -- Anisotropic contributions to the transferred hyperfine field studied using a field-induced spin-reorientation -- Use of Mössbauer spectroscopy to determine the effect of salinity on the speciation of triorganotins in Anacostia River sediments -- 57Fe Mössbauer spectroscopic study of (25?x)MnO-xZnO-15Fe2O3-60B2O3 glasses -- Studying surfaces and thin films using Mössbauer spectroscopy -- Variations of BaSnF4 fast ion conductor with the method of preparation and temperature -- The Mössbauer community in the USA -- Two earth years of Mössbauer studies of the surface of Mars with MIMOS II.

Progress in various areas of applications of Mössbauer Effect is reported in this volume. Among the recent developments, applications of synchrotron radiation in geophysics and biophysics through the measurement of phonon density of states of proteins and enzymes, and laboratory based high- pressure experiments in elucidating the electronic nature of correlated electron systems in condensed matter physics are some examples. Furthermore, almost after five decades of its discovery, with two Mössbauer spectrometers working on the surface of the Mars provided the first glimpse of the nature of iron containing minerals. With additional contributions from applications to nano-science and studies of amorphous systems will make this volume of special interest to materials scientists, chemists, mineral and condensed matter physicists, and inorganic biochemists alike. The conference and its proceedings are dedicated to one of the pioneers of Mössbauer Spectroscopy, late Dr. Stanley Ruby, whose original ideas, insight and enthusiasm helped create new research fields.