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<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Colleagues,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">We write to convey the sad news that Jac</span><span style="color:black">o</span><span style="font-size:11.0pt;color:black">b (Jack) Nachmias passed away on March 2, 2019 after a brief illness.
He is survived by his wife Dr. Vivianne T. Nachmias, daughters Lisa Nachmias Davis and Sarah Nachmias, and several grandchildren.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Jack was born June 9, 1928, in Athens, Greece. He left his home in Sofia, Bulgaria with the rest of his family in 1939 to come to America and escape the Nazis. Their departure was on the last ship
to sail from Paris. Jack was legally blind his entire life but refused to consider that a disability.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Jack graduated with his undergraduate degree from Cornell and obtained an MA from Swarthmore working with Hans Wallach and Wolfgang Kohler. He then received his PhD in Psychology from Harvard University.
The majority of his career was spent studying visual perception in the Department of Psychology at the University of Pennsylvania. He made fundamental contributions to our understanding of vision in a number of areas, most notably the study of eye movements,
the development of signal detection theory and forced-choice psychophysical methods, and the psychophysical characterization of spatial-frequency-selective visual channels. Indeed, Jack’s influence extended broadly in the vision science community. He was the
“psychophysicists’ psychophysicist,” an avatar of methodological precision, theoretical rigor, and joy in science.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Beyond his scholarship, he served two terms as Chair of Penn's Psychology Department and mentored numerous graduate students. Each of us benefitted </span><span style="color:black">personally on
many occasions</span><span style="font-size:11.0pt;color:black"> from Jack's wisdom, whether in the form of an explication of a technical matter, an idea about a better way to make a measurement, or advice about how to navigate a career or departmental matter.
More generally, Jack was always a pleasure to talk to about a wide range of subjects, from politics to music to art to good beer, and we always came away from our conversations with him richer for the interaction.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">As his father before him, his last written instructions were in Ladino (the Judao-Spanish of Sephardic Jews), "no me olvides," (don't forget me), and we never will.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">With Sadness,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">David Brainard</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Norma Graham<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Saul Sternberg<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Andrew Watson<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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