In Japan, with TV Asahi (a major commercial television network), Tanaka assisted with the
following productions:

       * July 1991: Bangladesh severely damaged by cyclone.
                           - Raised Japanese awareness of hard-hit Bangladeshi villages.
       * September 1991: Coup d'etat in U.S.S.R.
                           - Reported live, on location in Moscow and Moldova.
       * December 1991: Documentation of the Persian Gulf War.
                          - Exposed the Allied atrocity of burying alive both Iraqi Army soldiers and Bedouins.
       * September 1992: Asian Journalist conference on Yangtze River in China.
                          - Covered the first large journalism conference involving Japan, China and Korea.
                          - Reported on how damming the Yangtze River would affect Chinese villages.
        * December 1992: Major festival of the Thakali tribe in the Nepali Himalayas.
                          - Organized and filmed a cultural documentary highlighting the festival,which is held every twelve years.
         * March 1993: Nepal's Tharu tribe.
                          - Organized and filmed a cultural documentary.

From April 1993 to December 1994, as a freelance news assistant with NHK (Japan's public television network),
Tanaka assisted in the production of a series of nature documentaries:

        * Japan's 100 Famous Mountains (Series).
              - Informed the Japanese public of the magnificent natural environment of their home islands.

From September 1995 to May 1998, in Lawrence Kansas, with the cooperation of the University of Kansas and Haskell Indian Nations University, Tanaka produced two documentaries for KUJH-TV (Channel 14 News - University of Kansas television station) and :
           
       * Repatriation and Reburial of Native American Remains.
       * South Lawrence Trafficway Proposal.
             - Showing the Lawrence community the cultural differences between Native Americans and White Americans.
             - Creating a better mutual understanding between participants.

Since 1998, as a freelance video journalist, Tanaka so far has produced three documentaries:

        * The Dalai Lama's visit to Japan in 2000.
             - Fostering public awareness about the real face of H.H. the Dalai Lama,
        * TIBETAN REFUGEES: A Struggle Beyond Generations (Japanese version).
             - Fostering public awareness about the Tibet issue in Japan and elsewhere, highlighting identity-struggles of the third-                generation Tibetan refugees. {The exclusive interview with the Dalai Lama in April 1999}
        * TIBETAN REFUGEES: A Struggle Beyond Generations (English version).
             - Selected for several international film festivals including Himalaya Film Festival. Highlights identity-struggles of the t                   third-generation Tibetan refugees.

Since 2003, Tanaka has started activities as a producer:

       * Japan Video Topics with Ministry of Foreign Affairs (2003-2005/2008-2009)
            - Offered a comprehensive view of Japanese culture, society,nature, science and technology.
      * Himalaya Film Festival Tokyo 2006
      * HFFTokyo2006 related symposium: "What should we address global warming?"   
      * Himalaya Film Festival TOKYO 2008
      * Himalaya Film Festival WJ 2009
      * Himalaya Film Festival TOKYO 2010
          - Offered a opportunity to think about our mother earth through the Himalayan region. 

Since 2008, Tanaka has been the chief director of the Himalaya Archive Japan, a Japanese nonprofit organization officially certified by the Tokyo Metropolitan Government.