大誠法律事務所由陳逸如、陳宗憶、曾勤博三位律師創立。2008年，中部所成立；2010年1月，因應業務擴張，大誠法律事務所北部所成立；嗣於2011年6月，具多年醫師執業經驗的方莉莉律師加入。大誠法律事務所至此具備多位工程及醫療之雙專業背景之律師，以及由台灣大學法律研究所畢業之法律專業團隊，更結合美國律師、中國律師，提供全方位、專業性的服務。
大誠法律事務所秉持「精益求精、至誠待客」的理念，所受理案件均經嚴謹的團隊研究，由專責律師全程照顧執行，涉外案件經外國律師參與協助，為客戶解決問題。大誠法律事務所成立以來，成功處理了各類民事、刑事、行政訴訟案件，工程、醫療、軍事案件，及外人投資、法規遵循、投資中國、國際仲裁等各類商務案件。
大誠法律事務所堅持「關懷弱勢、在地關懷」，每年以自身專業，關注於病患、勞工、新移民等社會弱勢者的權益，全力給予扶助；並強調熱愛本土的精神，優先耕耘台灣本土環保、消
費者保護、公共工程安全等社會議題。
Ru-I & Tseng Attorneys-at-Law was established in 2008 by Louis Yi-Ru Chen, Bob Chin-Po Tseng, and Joey Tsung-I Chen . Ru-I & Tseng Attorneys-at-Law combines the diverse backgrounds of our attorneys with a strong cooperation with lawyers in the United States and China. In addition to comprehensive, professional legal services, we provide extensive assistance in cross-border business matters and Chinese legal consultation. Ru-I & Tseng Attorneys-at-Law upholds the standard of “World-class service at a competitive price.” Every case we process will be given our fullest attention, and approached in a collaborative fashion. We believe in a transparent, explicit pricing structure – and firmly hold to our mission of providing high quality legal representation at reasonable prices. Ru-I & Tseng Attorneys-at-Law adheres to the principle of “Care for disadvantaged, Affection for the Native Land”. Every year we focus on the rights of such minorities as patients, laborers, and immigrants and provide support with all our professional strength. Additionally, we insist on the spirit of love for Taiwan, and hold in high esteem the issues of environmental protection, consumer protection, security in public works, and other socials. We live in Taiwan, grew up in Taiwan, and are dedicated to Taiwan.
