The phrase "assumed an active role" is correct and usable in written English.
You can use it when describing someone who has taken on a proactive or engaged position in a particular situation or activity.
Example: "During the project, she assumed an active role in coordinating the team and ensuring deadlines were met."
Alternatives: "took on a proactive role" or "played an active part".
After Sun's death in 1925, Song Qingling assumed an active role in politics.
In 1940, Mr. Capa married Edith Schwartz, who assumed an active role in his professional life, maintaining his negatives and archives, and also those of his brother.
Once again, the Clinton comeback kicked into gear with his much praised Clinton Global Initiative, until he assumed an active role in his wife's bid for the 2008 presidential nomination.
Following completion of his legal studies at Centre College in Danville, Ky., in 1911, Vinson entered private practice in Louisa and quickly assumed an active role in local political affairs.
The owner Arthur Blank has assumed an active role in the club's day-to-day operations, but he spends a majority of his time on the business side with the team president Rich McKay.
In our pilot, nearly two-thirds of caregivers assumed an active role in monitoring the medication prescribed for patients, and 94% of caregivers stated that they felt the program improved their understanding of dementia and improved their ability to help the afflicted patients.
The model assumes an active role of RAYTs in REP proliferation, based on their REP-dependent nuclease activity [ 23] and coupling of transcription and translation in uncompartmentalized bacterial cell, allowing for preferential RAYT action on REPs that flank their encoding genes (due to their juxtaposition during RAYT expression).
In addition, they assume an active role for the audience and fulfill a clear and important function for the societies that maintain them.
He wants to assume an active role, that's his entertainment". Canby never married but was, for many years, the companion of his fellow critic, Penelope Gilliatt.
Libraries have a societal purpose and this role has become increasingly important as new technologies enable organizations to support, enable and enhance the participation of users in assuming an active role in the creation and communication of information.
