Get a column's value(s) based on another column's max

In my table, I have a calculated column (NumFailedLogins) which shows the number of times a user appears based off of a condition. Now, I want to get a value from another column (User) based off of the max from the calculated column (NumFailedLogins). There is a possibility of multiple users having the same max value, but I only need to return at least one of them.

In the above example, I would like to return either Mary or John (or both if that's even possible. If not, it's fine).