"by whomever" is a correct and usable phrase in written English.
You can use it when the speaker is unsure of who is responsible for performing an action or when you want to emphasize that whoever is responsible should perform the action. For example, "The job should be completed by whomever is available."
But of course, the things that enable that approach – a vast network of sensors amounting to millions of electronic ears, eyes and noses – also potentially enable the future city to be a vast arena of perfect and permanent surveillance by whomever has access to the data feeds.
A total disbeliever, I leafed through the binder at the concierge desk, finally requesting an aura cleansing by whomever was free, which turned out to be Renee, a barefoot, barrel-chested woman with spiky orange hair and a rayon dress to match.
Back in the day, when the iTunes Music Store first debuted (only on the Mac, remember), you'd see comments on tech sites along the lines of, "Why has it taken so long for something like this to come out?" No more having to troll early BitTorrent search engines for the latest album by Whomever.
"Have you read the latest (whatever by whomever)"?
Hence, Jamie Dimon indignantly protesting his verbal mistreatment by the press, by the White House, by whomever.
Three times governor of the state, he strengthened his power base by allying with whomever was in power in Brasília.
All those iconic photos — recreated by Andy Samberg!" Whomever you are, crazy art director, you are my gonzo hero for the day.
The effect part — modified by Dinkins, Wilder, Bradley, whomever — is a combining form that Rose Martino at Merriam-Webster says was popularized in 1966 by ripple effect and domino effect and more recently by greenhouse effect.
Just as misery loves company, anger (at the media, at the president, at whomever) is fueled by it.
Is somebody tackling you today, too?' " It's not unusual to see McNabb showing that sense of humor when walking through the Eagles' practice facility, conversing easily with whomever he walks by.
