Latest results on g1 and g2 at high x

Recent progress from Jefferson Lab has significantly improved our understanding of the nucleon spin structure in the high-x region. Results of a precision measurement of the neutron spin asymmetry, A(1)(n), in the high-x (valence quark) region are discussed. The up and down quark spin distributions in the nucleon were extracted. A(2)(n) was also measured. The results were used, in combination with existing data, to extract the second moment, d(2)(n). Preliminary results on A(1)(p) and A(1)(d) in the high-x region have also become available. Finally, the results of a precision measurement of the g(2) structure function to study higher twist effects will be presented.