Asa Keisar is an Israeli religious scholar and lecturer and author of Velifnei Iver HaShalem, in which he states that eating meat and animal by-products is no longer permitted according to Jewish sources, because of the cruelty inflicted on animals by the modern mass production of meat, dairy and eggs. The book is distributed to tens of thousands of students throughout Israel annually.

Asa Keisar is also the initiator and founder of the Vegan Kosher Certification which is the only one of its kind, combining Kashrut and Veganism in one stamp. Vegan Kosher was established in order to make tens of thousands of Vegan Kosher items accessible to vegan consumers.

His lecture on Religious Veganism, has been viewed on YouTube by over six million Israelis.