Emanuel Edward Klein, FRS, (1844–1925), Croatian born British microbiologist. Sometimes credited as the 'Father of British Microbiology'. He was a professor at St. Bartholomew’s Hospital Medical School in London. Elected as a Fellow of the Royal Society of London in 1875.
Unknown author<span style="display: none;">Unknown author</span>
Undated, before 1925 (death of subject)
<p>Atalić B. &amp; Fatović-Ferencić S. (2009). <a rel="nofollow" class="external text" href="http://tpx.sagepub.com/content/37/6/708.long">'Emanuel Edward Klein—The Father of British Microbiology and the Case of the Animal Vivisection Controversy of 1875'</a>, <i>Toxicologic Pathology</i>, <b>37</b>(6):708-13. 
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<br>(Portrait from Saint Bartholomew’s Hospital archives)