'impressive contribution' is a correct and usable phrase in written English.
You can use it when referring to a positive influence or effect someone or something has had on a particular situation or area. For example: Mary's impressive contribution to the company helped to make it much more successful.
Burtin's most impressive contribution was the marriage of science and design.
With Everton's Abel Xavier omitted despite his impressive contribution against England, they could not even cross for toffee.
They are particularly hard to understand when you look at the hugely impressive contribution that music and the other creative industries make to the UK.
Rooney sealed his impressive contribution by setting up Mata to at yield material reward for United's supremacy with 20 minutes left.
In extra time there was a half-chance for Vaughan, a less than impressive contribution from Berbatov and - mercifully - we were at the penalties.
Sadly, for the fourth time in five stages he finished second or third, this time behind the former cyclo-cross star Stybar, who made an impressive contribution to an increasingly weird week for Etixx-Quick Step.
Since 1951, the Ivy League college has bestowed the awards to entertainers for impressive contributions.
Both men have made impressive contributions to our collective culture, and we are the richer for it.
Mr. Outlaw made the most impressive contributions, singing with a lyrical voice, crisp diction and dramatic conviction.
Those who sent presents were thanked for their "impressive" contributions, with special mention being given to the schoolchildren and Girlguiding groups who sent their wishes.
There are impressive contributions from two excellent German singers: the bass-baritone Falk Struckmann as Don Pizarro and the bass Rene Pape as Rocco.
