Dusan first came as a post doctoral researcher in Fall 73 to end of summer 74, then again Fall 75 to end of summer 76, and then joined NSSL permanently in Jan 78. The accomplishments listed here are only a small sample of his contributions to NSSLís Radar Research. The relation of Doppler spectra to tornadoes is the basis for present day research being supported by the NWS and pursued by Faculty (Tian Yu) at OU. The initiation of polarimetric research began in 1978 with discussions with Canadian scientists (Brian Barge and Bob Humphreys) who had shown promise of polarimetry to improve the utility of weather radars. The design flaw was the implementation of circular polarization for the WSR-88D design. Because of propriety concerns NSSL scientists (including Dusan) were not informed of the designs being considered for the WSR-88D. We only heard about the use of circular polarization through friends who were on design review boards. But the information came too late for the NWS to make changes to the pre-production radars (i.e., 10 radars). These first ten radars were deployed with circular polarization and later changed to linear polarization.