After his stint in the student movement, Teddy joined the Kilusang Mayo Uno (KMU - May First Movement).
His childhood ambition and his father's wishes for him to become a lawyer gave way to his activism.
In 1996, he entered the UP College of Law only to leave it three days later when it interfered with his work in the KMU.

After four years in the KMU, he joined the Bagong Alyansang Makabayan (BAYAN), the largest alliance of progressive people's organizations in the country.
He was elected secretary general in 1999 and was catapulted to national prominence in 2001 as one of the youngest leaders of EDSA 2.

Casino was appointed commissioner of the EDSA People Power Commission but was removed for constantly being critical of the current administration.
 He had a short stint in ABS-CBN's Hoy Gising and The Correspondents.
In 2002, he was accorded the UPLB Distinguished Alumni Award for Extension.

As a writer, Casino was a regular contributor to the Philippine Daily Inquirer's Youngblood column from 1994-1996.
In 1995, he became a regular columnist for Business World, one of the most respected business newspapers in the country.
He also wrote columns for the tabloids People's Bagong Taliba and Frontpage, the OFW weekly Pinoy Gazette and the online magazine Bulatlat.com.
After his stint in the student movement, Teddy joined the Kilusang Mayo Uno (KMU - May First Movement). His childhood ambition and his father's wishes for him to become a lawyer gave way to his activism. In 1996, he entered the UP College of Law only to leave it three days later when it interfered with his work in the KMU.
After four years in the KMU, he joined the Bagong Alyansang Makabayan (BAYAN), the largest alliance of progressive people's organizations in the country. He was elected secretary general in 1999 and was catapulted to national prominence in 2001 as one of the youngest leaders of EDSA 2.
Casino was appointed commissioner of the EDSA People Power Commission but was removed for constantly being critical of the current administration.  He had a short stint in ABS-CBN's Hoy Gising and The Correspondents. In 2002, he was accorded the UPLB Distinguished Alumni Award for Extension.
As a writer, Casino was a regular contributor to the Philippine Daily Inquirer's Youngblood column from 1994-1996. In 1995, he became a regular columnist for Business World, one of the most respected business newspapers in the country. He also wrote columns for the tabloids People's Bagong Taliba and Frontpage, the OFW weekly Pinoy Gazette and the online magazine Bulatlat.com.
Teodoro Casiño