Who was the author of the Gāthā of Dependent Origination?
缘起偈是谁作的？

It was uttered by the Buddha's disciple Assaji. (Assaji, meaning "Victory of Horse", was one of the first five Bhikkhus.) One day, when Bhikkhu Assaji was begging with his alms-bowl, he ran into Sāriputta, the great Brahmanic scholar. The latter was attracted by his venerable countenance which was out of the common run, so he inquired of Assaji who was his teacher and what doctrine he was professing. Thereupon, Bhikkhu Assaji uttered this Gāthā. Sāriputta was delighted to hear this and went to tell Moggallāna on his return. Then both of them became followers of the Buddha. There are several Chinese translations of this Gāthā. "My teacher, the great Samaṇa" refers to Sākyamuni. In general, Samaṇa may be simply rendered as ascetics (or mendicant friars) who renounced the family life. At that time, all ascetics regardless of religious sects (except in Brahmanism) were called samaṇas.
是佛的弟子阿说示（Assaji，最初五比丘之一，意译是“马胜”）说出的。有一天马胜比丘在托钵行乞的时候，遇见了婆罗门大学者舍利弗。舍利弗看见他容貌威仪，不同常人，便问他向谁学道，教义如何。马胜比丘便说出了这首偈，舍利弗听了很欢喜，回去向目犍连说了，两个人便一起归依了佛。这首偈我国有几种译文，偈中“吾师大沙门”，是指释迦牟尼，沙门（Samaṇa），简单地意译就是出家修道者。当时婆罗门教之外各教派的出家修道者都称为沙门。