The phrase "are active in developing" is correct and usable in written English.
You can use it to describe individuals or organizations that are currently engaged in the process of creating or improving something.
Example: "The researchers are active in developing new technologies to combat climate change."
Alternatives: "are engaged in creating" or "are involved in advancing".
The American National Standards Institute and the American Nuclear Society are active in developing standards for processes and procedures in the nuclear industry.
Yet the agents with the FBI's behavioral group, some of whom also are active in developing profiles of terrorists and criminals who prey on children, believe they can develop profiling strategies that will help undercover agents ferret out corrupt corporate titans, shady hedge fund traders and other Wall Street con artists.
Thus, nurses who have knowledge and competence in EBP; access to resources; experience support; or are active in developing evidence-based guidelines and procedures have more belief in EBP.
Angiogenesis is a vital process in growth and organ development; it is active in developing human CNS [ 20] but quiescent in adult human brain [ 21].
Both government and private laboratories have been active in developing laser separation methods for rare stable isotopes of other elements.
Although that job was short-lived, in the period before the collapse of the Soviet Union he was active in developing the "500-day plan," a sweeping economic reform plan that was tried but never fully carried out under the Soviet president, Mikhail S. Gorbachev.
Another well established group in the field is Ansaldo, whose subsidiaries include the CRIS research consortium in Naples, which is active in developing superconducting films.
(See: Doctors, Untethered) It's no wonder that GE, which has been active in developing high-tech hospitals for years (See: The Hospital of the Future), would want to further bolster its medical information technology business.
The future of these deterministic models has been challenged by various researches (Grayson et al. 1992; Smith and Goodrich 1996) and many researchers have been active in developing spatially distributed and stochastic models (Beven and Moore 1992; Romanowicz et al. 1993).
