Usually we refer to a dead person using the past tense. For example:
Albert Einstein was wrong about…
But when we are talking about both dead and alive persons in the same sentence, should we use past or present?
a) Einstein and Tarantino are wrong.
b) Einstein and Tarantino were wrong.
The alive person (i.e. Tarantino) is still wrong about things and still doing it.
Best Answer
We don't refer to dead people as still being wrong or right. They are neither, since they are dead (or if you prefer, they now have access to better information).
So you cannot say either Einstein is right or Einstein is wrong.
When referring to opinions living people expressed in the past, it is usual to use the past tense, unless you are certain that the opinion is still held by that person. So here you would say Einstein and Tarantino were wrong, since you don't actually know Tarantino's present opinion on the subject.
If you want to express that this is still Tarantino's opinion, your best option is "Einstein was, and Tarantino is, wrong" or possibly "Einstein was wrong, and Tarantino is wrong", or "Einstein was wrong, as Tarantino is", and so on.
To refer to two subjects, one in the past tense and one the present, you need two verbs, one past tense and one present.