November, 1962	Born in Tokyo. At present, 47 years old.
May-, 1979	When a sophomore at Komaba High School (part-time), Tokyo, boldly carried out the around-the-world bicycle trip with self-earned money and in one and half year traveled 20,000 km and visited 26 countries.
September, 1981	While preparing for college published "Jurokusai no Oriza no Boken o Shirusu Hon (The Adventures of 16-year-old Oriza --Abbreviated title)," his journal of the bicycle trip, from Banseisha publishing company.
October, 1981	Passed the College Entrance Qualification Exam and quitted high school.
April, 1982	Entered International Christian University (ICU), college of liberal arts humanities division.
November, 1982	While a freshman, wrote the first play and later established Seinendan Theater Company.
August, 1983	Published "Jukenno Kunino Oriza (Oriza and the Entrance Exams)," a book on his experience on preparing for the college entrance exams, from Banseisha.
August-, 1984	Received the International Education Fund scholarship to study at Yonsei University, Seoul, Korea, for one year. Learned the Korean language and experienced tear gas.
December, 1985	Returned from Korea and was featured in the last episode of "Shinjinrui no Kishutachi (Color-bearers of the New Generation)" in Asahi Journal magazine.
June, 1986	Graduated from International Christian University, college of liberal arts humanities division.
July, 1987	Started directing.
March-, 1988	Put on a trilogy on Korea. Intentionally started creating performances with the new directing style. (This list hereafter shows Hirata's activities outside Seinendan, his own company. Please see "Milestones of Seinendan" for Hirata's activities as a playwright and director in Seinendan.)
January, 1989	As the artistic director of Komaba Agora Theater, held the first Daiseikimatsu Engekiten (the End-of-Millennium Theater Festival), an annual showcase of various theater groups from all over Japan. Has worked as the festival director ever since.
June, 1990	Wrote "Chinese Soup," the first play for a theater company other than his own. This piece was directed by Hiroshi Ohashi. The production took place at Proto Theater, Takadanobaba.
July, 1990	Assisted the Korean theater companies participating in Tiny Alice Festival. Took part in Doro Gekijo (Theater on Street)'s performance in Vanuatu to celebrate the 10th anniversary of the Republic of Vanuatu. Doro Gekijo is an Aomori-based theater group.
May, 1991	Wrote "Aho Ressha (Travel on Train)" which made a long run of over a year by Ganso Engekinomoto Ikiza theater company, starting in August this year.
May, 1992	Published "Doro Gekijo Vanuatu e iku (Doro Gekijo Performs in Vanuatu)," the journal of the above tour, from Banseisha.
June, 1992	The new script, "Sayonara dakega Jinsei ka (Isn't Life More than Goodbyes?)" appeared in a magazine ("Les Specs") for the first time.
November, 1992	Was nominated for Kishida Drama Award for "Hokugen no Saru (Northernmost Monkeys)."
January, 1993	Worked as the festival coordinator for the first Japan-Korea Dance Festival.
April, 1993	Started writing a series of essays entitled "Ima Yaroto Omottetanonii (I was Just about to Do It...)" for Asahi Weekly magazine.
Decamber, 1993	Was assigned as an advisory staff member for the research group for cultural promotion of the Ministry of Home Affairs.
July, 1994	Held workshop for high school students sponsored by Aoyama Circular Theater.
November, 1994	Wrote and directed "Tenkosei (Transfer Student)" for the performance by the selected participants of the above workshop.
December, 1994	Started writing a series of essays entitled "Tabikara Kaereba (Home Again)" for La Teatro magazine.
February, 1995	Won the 39th Kishida Drama Award with "Tokyo Note (Tokyo Notes)."
March, 1995	Published "Gendai Kogo Engeki no tameni (For Contemporary Colloquial Theater)," the first book on drama theories, from Banseisha, which was highly acclaimed. Wrote "Madokara Anataga Mieru (I See You Through the Window)" for MODE theater company for their production for Tokyo Drama Fair.
May, 1995	Published "Hirata Oriza Gikyokushu 1 Tokyo Note/S Kogen kara (Hirata Oriza's Plays I: Tokyo Notes/From S Plateau)" and "Hirata Oriza Gikyokushu 2: Tenkosei (Hirata Oriza's Plays II: Transfer Student)" from Banseisha.
July, 1995	Started writing periodically for Nihon Keizai Shimbun Promenade.
May, 1996	Bungakuza theater company performed Hirata's play, "Omoidasenai Yume no Ikutsuka (Some Forgotten Dreams)." Published "Hirata Oriza Gikyokushu 3: Kataku ka Shura ka/Angu Shoden (Hirata Oriza's Plays III: A Burning House, or Shambles?/Confession of a Feeble Mind)" from Banseisha.
December, 1996	Wrote "Odoriko (The Dancer)" for Kanasuzi Tadao Associates theater company.
June, 1997	Published "Toshini Shukusaiwa Iranai (Cities Need No Festivities)," the second book on drama theories, from Banseisha.
November, 1997	Wrote "Tsukiga Tottemo Aoikara ('Cause the Moon is So Bright Tonight)" for Bungakuza theater company.
December, 1997	Wrote the script for "Fairy Tale," [P4] joint production. [P4] is a group of 4 young leading Japanese directors, of which Hirata is a member.
June, 1998	"Tokyo Notes" in the French language was published in France (translated by Rose-Marie Makino-Fayolle).
October, 1998	Published "Engeki Nyumon (Introduction to Drama)" from Kodansha publishing company, as one of Kodansha Gendai Shinsho series.
February, 1999	Wrote "Meoto Zenzai" for Ryu Sho Kikaku theater company.
April, 1999	Served as the festival director of Toga Spring Festival.
September, 1999	Wrote and directed "Tooi Hibi no Hito (People of the Far Away Days)" for Engeki Shudan En theater company.
December, 1999	Visited France for the French production of "Tokyo Notes" and 2-month rehearsal in Brest, a city to the northwest of Paris.
January-march, 2000	Presents "Tokyo Notes" in Brest, Paris, Aubusson, and Clermont-Ferrand. The cast is mainly consisted of French actors.