1985–1986, he was an instructor in Molecular Embryology of the Mouse at the Cold Springs Harbor Laboratory and a Resident Instructor of Embryology at the Marine Biological Laboratory at Woods Hole. From 1986 to 1987, he held a visiting professorship at the Hopkins Marine Station of Stanford University. Research Schatten's research focuses on imaging, cell biology, cell motility, cell architecture, human and other primates assisted reproductive technology (ART), reproductive and cell aging, cloning, transgenesis, and stem cells. His research has been funded through the National Institutes of Health as well as the National Science Foundation, the United States Department of Agriculture, the United States Environmental Protection Agency, and the NASA. Schatten's work has been published extensively in many journals, such as Science, Nature, Lancet, Nature Medicine, Nature Cell Biology, Journal of Cell Biology, Genetics, Development, Developmental Biology, Biology of Reproduction, Human Reproduction, and the Journal of Law, Medicine and Ethics. Fertilization and reproduction Schatten's work on fertilization examines the differential inheritance of cellular components contributed by the sperm and egg, respectively, as well as the program of oocyte activation and cell division during meiosis and mitosis. His group has demonstrated the importance of the sperm centrosome-centriole complex during mammalian fertilization (including humans), with the unexpected exception of rodents in which the centrosome is of maternal origin (see Selected Publications). Imaging and microscopy Schatten also made contributions to imaging and microscopy. In his first published paper, he demonstrated the utility of polylysine and other engineered peptides that could adhere to cells, embryos, and intracellular structures for various microscopic applications and purifications (see Selected Publications). This technology is now widely applied and has solved the problem of holding cells for imaging. His team also published findings on imaging calcium and other ion transients in egg, embryos and cells, as well as dynamic architectural alternations during fertilization and cell division (see Selected Publications). Transgenesis and stem cells His more recent research has focused on the use of human and primate stem cells to determine the potential of stem cell-based medical therapies and better understand cell and human development; the study of genetic versus epigenetic (environmental) causes for human disease; cloned transgenic disease modeling (using primates) (see Selected Publications). Bioethical considerations Schatten has also published on the topic of scientific ethics, including a 1998 piece on bio-ethical aspects of ART, "Art before Science?", in the Journal of Law, Medicine & Ethics as well as