Rubenstein Public Relations hires Richard Silverman, a veteran of Merrill Lynch, Lazard, Mitsubishi UFJ Financial Group, Burson-Marsteller and Dow Jones Indexes... Thompson & Co. Public Relations promotes Bri Kelly to VP... Waterhouse Brands, a boutique marketing agency that works with life sciences companies, brings on David Mickle as chief client officer and Ben Hewitt as managing director, creative and digital services.