In a glass with ice, combine the Campari, gin and orange juice and stir. Pour the IPA over the top. Serve immediately.
To make a larger batch: In a pitcher, combine 1 part Campari, 1 part gin and 1 part orange juice and stir to combine. When serving, add ice to the pitcher and pour 1 part beer over top. Serve immediately.
Recipe courtesy of Geoffrey Zakarian