1961	名古屋市中区の「大坪旗店」に生まれる
	Born the first son of parents who run Otsubo Flag Shop in Nagoya City
1984	南山大学経営学部卒業 株式会社「両口屋是清」入社
	Graduated from Nanzan University, Faculty of Business Administration Entered Ryoguchiya Korekiyo Co., Ltd., an old-established Japanese confectionary maker
2000	家業を手伝う傍ら工芸染色を始める
	Started handicraft dyeing while helping family business
2004	伊勢型紙作家六谷春樹氏に師事 型彫を習得し型染を始める
	Studied under Rokutani Haruki, an Ise-Katagami artist *Ise-katagami: Japanese craft of making paper stencils for dyeing textiles Mastered engrave patterns and began pattern dyeing
2008	草木染作家柴田玲甫氏に師事 草木染と出会い魅了される
	Studied under Shibata Reiho, a natural dyeing artist Attracted to natural dyeing
	三代「與七郎」を襲名 第五回草木染展「国際ビエンナーレinあいち」入選 八事山興正寺に大のれん（横幕）奉納
	Succeeded to his predecessor's name "Sandai Yoshichiro" (Yoshichiro III) Won a prize at the 5th international natural dyed artworks exhibition "Natural Dyeing Biennale in Aichi" Dedicated Noren (traditional Japanese fabric banner) to Yagoto Koshoji Temple
2009	名古屋市（民）美術展に出展 柿渋染「よろこび」が名古屋市長賞を受賞
	Submitted work to Nagoya Citizens Art Exhibition Won a Mayor of Nagoya Prize by "YOROKOBI" of dyeing with persimmon tannin
2010	第四十九回日本現代工芸美術展入選
	Won a prize at the 49th Japan Contemporary Arts and Crafts Exhibition
	第六回草木染展「国際ビエンナーレinあいち」入選
	Won a prize at the 6th international natural dyed artworks exhibition "Natural Dyeing Biennale in Aichi"
	法相宗大本山薬師寺に柿渋染「薬師寺東塔を照らす」を奉納
	Dedicated "Illuminating the East Tower" of dying with persimmon tannin to the world heritage historic monuments of ancient Nara Yakushiji Temple
	愛知学院大学歯学部創立50年記念品として「円寿」製作
	Produced "Enju" as the 50th anniversary commemorative work, School of Dentistry, Aichi Gakuin University
	ジャパンウィークポルト大会にて公演
	Had a workshop at the Japan Week Port
2011	第43回日展入選
	Won a prize at the 43 NITTEN (Japan Fine Arts Exhibition)
	第五十回日本現代工芸(美術)展にて東海テレビ賞受賞
	Won a Tokai Television Prize at the 50th Japan Contemporary Arts and Crafts Exhibition.
2012	個展「草木染～いにしえの煌～三代　大坪與七郎展」 第44回日展入選
	Had the private exhibition "Natural Dye – Inisieno Kirameki – Sandai Yoshichiro Exhibition" Won a prize at the 44 NITTEN (Japan Fine Arts Exhibition)
2013	日本・フランス現代美術世界展　入選
	Had the private exhibition "Natural Dye – Inisieno Kirameki – Sandai Yoshichiro Exhibition"
2014	第46回ポルトガル美術賞展　入選 `14 サロン・ドトーヌ展　入選
	Won a prize at the Japanese Today’s Visual Art Exhibition in Portugal 2014 Won a prize at the Salon d’Automne 2014
2015	第47回ベルギー・オランダ美術賞展　推薦 `15 サロン・ドトーヌ展　入選
	Entered the Japanese Today’s Visual Art Exhibition in Belgium and Netherlands 2015 Won a prize at the Salon d’Automne 2015