Formal way to say "I believe" [closed]

I am writing a chapter in a book and I want to say that "I believe that this researcher is right ....", in a more formal way. Can I say "The present author believes ....."

I would expect the question to be closed as a matter of opinion. And this answer may also have a short future, since it is writing guidance.

In academic writing, saying I believe that this researcher is right ... is inappropriate for multiple reasons.

• I [whatever] violates most academic style guides, whatever we may think of them. You should avoid writing in the first person. If you must mention yourself, use this author/writer/researcher/commentator/etc.

• I believe is redundant. You wouldn't be writing it if you didn't believe it.

• The this researcher part is unclear. I will assume you mean the author of the work you are discussing.

• right is an absolute value judgement, and should definitely be avoided unless the topic is religion or morals, or perhaps philosophy and you know what you are doing. Use phrases such as

  • x makes a strong case that etc
  • x has a sound argument for etc
  • x supports his contention well that etc

Since you say you are writing a book chapter I suggest you contact the intended publisher for editorial guidance.

In conclusion, the formal way to say I believe is to not say it.