The University of Texas International Office (International Student and Scholar Services) home page is here: https://world.utexas.edu/
Their main web page for international faculty and scholars is here: https://world.utexas.edu/isss/scholars
For information regarding Visa and eligibility concerns, Visa extensions, transitioning from J1 to H1B visa status and applying for a greencard make an advising appointment at the International office:
http://world.utexas.edu/isss/advising#scholar
Monthly social hour, hosted by ISSS: http://world.utexas.edu/isss/intercultural/scholarsocialhour
Paid internships are often not permitted for International Postdocs. Volunteering permits other networking opportunities: www.volunteermatch.org