Among the clients who have benefited from the services of Sellmark are:
- Alamo Productions: Frank Thompson (North Hollywood, CA) - Public Relations, Strategic Planning
- Army Historical Foundation/The Smithsonian Institution (Washington, DC) - Fundraising
- Attic Archives (San Francisco, CA) - Marketing
- Bexar County Medical Society - Research
- Center for American History (University of Texas at Austin) - Public Relations
- Creative Perfumes - Sales and Marketing
- Diamond Warkenthein and Swindall (NextStep Solutions) - Sales Training
- Guadalupe Cultural Arts Center - Fundraising
- Harry Ransom Humanities Research Center (University of Texas at Austin) - Marketing, Research, Public Relations
- HealthcheckUSA - Marketing, Strategic Planning
- Institute for Spanish Arts/Maria Benitez Flamenco (Santa Fe, NM) - Fundraising
- Mexican Institute of Greater Houston, Inc. (Houston, TX) - Fundraising
- National Rural Water Association (Duncan, OK) - Public Relations
- Neill-Cochran Historical House Museum - Strategic and Marketing Planning
- Pan American Congress on Aging - Fundraising
- San Antonio Botanical Garden - Marketing, Public Relations, Fundraising, Event Planning
- SAMMinistries - Fundraising
- San Antonio Symphony - Fundraising
- San Jacinto Historical Advisory Board (Houston, TX) - Public Relations
- San Jacinto Museum of History Association (Houston, TX) - Marketing, Fundraising, Public Relations, Event Planning
- Texas Military Institute - Marketing, Fundraising
- Texas State History Association - Marketing, Research
- The French Legation (Austin, TX) - Fundraising
- University of Texas Health Science Center at San Antonio - Fundraising
- US Oncology - Public Relations, Event Planning
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