Visas

To attend the PASI conference you may require a tourist visa to Brazil and to Argentina.

Argentina

U.S. citizens do not require tourist visa.
http://www.visa4you.net/argentina-visa.html

Other nationalities exempt from a visa can be found in:
http://www.visaworld.co.uk/_argentina.html

Contacts in US: Consular Section of the Argentine Embassy, 1811 Q St., NW, Washington, DC 20009 (202/238-6460) or the nearest Consulate: CA (213/954-9155), FL (305/373-1889), GA (404/880-0805, IL (312/819-2610), NY (212/603-0400) or TX (713/871-8935). Internet: www.embassyofargentina-usa.org

Brazil

A tourist visa is required from holders of US passports and several other countries to enter Brazil.
Nationalities exempt from a visa can be found in: http://www.visaworld.co.uk/_brazil.html

Information for applying to a visa for traveling to Brazil can be found in http://www.brasilemb.org/consulado/consular_visa_tourism.shtml

Contacts in US: Brazilian Embassy (Consular Section), 3009 Whitehaven St. NW, Washington, DC 20008 (202/238-2828) or nearest Consulate: CA (323-651-2664 or 415-981-8170), FL (305-285-6200), IL (312-464-0244), MA (617-542-4000), NY (917-777-7777) or TX (713-961-3063). Internet: www.brasilemb.org

Obtaining visa

You should allow at least one month to obtain your visa, whether for Argentina or Brazil.
Two agencies that provide visa service in the U.S. are the following:

Visa Express: http://www.visa4you.net/

Passports and Visas: http://www.passportsandvisas.com/