2 sentences

1. 他是这次慈善募捐活动的主要发起人。

   tā shì zhè cì cí​shàn mù​juān huó​dòng de zhǔ​yào fā​qǐ​rén.

   He is the main organizer of this charity fundraising event.

   Source: Dong Chinese Dictionary

2. 作为公司的发起人，他在成立大会上发表了讲话。

   zuò​wéi gōng​sī de fā​qǐ​rén, tā zài chéng​lì dà​huì shàng fā​biǎo le jiǎng​huà.

   As the founder of the company, he gave a speech at the inaugural meeting.

   Source: Dong Chinese Dictionary