Pierce Allman, who made his mark on Dallas in fields including real estate, journalism and philanthropy, has died at the age of 88. Allman, a co-founder of luxury residential real estate firm Allie Beth Allman & Associates, witnessed the assassination of President John F. Kennedy in Dealey Plaza, established a public relations division for advertising agency Tracy Locke, and served in many capacities for his beloved alma mater, Southern Methodist University.