Allegra Clegg
production manager

RECENT SCORES: UPM on big-budget actioners “Transformers,” “Transformers: Revenge of the Fallen” and “Hancock.” “What we do is like combining the circus with the military,” says Clegg, an industry veteran. “We’re working in a creative profession where there are specific rules that have to be followed, forms that have to be filled out, in order for everything to happen.”

COMING UP: The next installment of “Transformers,” skedded for release in 2011. “(Director) Michael Bay is incredibly efficient on a set,” says Clegg. “He knows how to get things done.”

Alfonso Gomez-Rejon
second unit director

RECENT SCORES: The multifaceted director/producer helmed second unit for Nora Ephron (“Julie and Julia”), Alejandro Gonzalez Inarritu (“Babel”), Kevin Macdonald (“State of Play”) and Ryan Murphy (“Eat Pray Love”). “On a particularly difficult night shoot in India on ‘Eat Pray Love,’ hundreds of locals crowded our set, effectively shutting us down,” he reports. Pretending to wrap, the crew “quickly started rolling again as soon as they walked away — not easy with multiple cameras, cranes, 60 action vehicles and 200 extras.”

COMING UP: Directed “Laryngitis” episode of “Glee,” with more episodes planned. Has deals with Anonymous Content, Misher Films, GK Films and Plan B Entertainment. Will helm Plan B’s “The Fortress of Solitude.”

Cherylanne Martin
line producer

RECENT SCORES: As line producer on HBO miniseries “The Pacific,” reportedly budgeted at more than $200 million, Martin found herself right in her element while working on its 10 one-hour episodes. “My strength is pulling apart projects into workable pieces and then getting them to the finish line,” she says.

COMING UP: Martin, who spent more than 18 months on “The Pacific,” is now in the research and development phase on HBO miniseries “Undaunted Courage,” the story of the Lewis and Clark expedition. She’s collecting background on the project, from the trails the explorers traveled to animals they encountered. “It’s incredibly rich material,” she says.

Josh McLaglen
1st AD

RECENT SCORES: After “Titanic,” McLaglen went on to collect credits on “Cast Away,” “The Polar Express,” both “Night at the Museum” pics and “Date Night.” A specialist in motion capture and 3D, he recently returned to James Cameron’s side for “Avatar.” “It’s an incredible ride working with someone like Cameron,” says McLaglen, son of actor Andrew V. McLaglen and grandson of actor Victor McLaglen. “He’s a pioneer, and he works so far ahead of everyone else.”

COMING UP: McLaglen is at work on the Hugh Jackman film “Real Steel,” helmed by “Date Night’s” Shawn Levy.

David Leitch, left, & Chad Stahelski, right
second unit directors/stunt coordinators

RECENT SCORES: The duo earned early buzz for their work on “The Expendables,” slated for release in August. After sharing a World Stunt Award nom for “The Matrix Reloaded” in 2004, they collaborated on “Ninja Assassin,” “Speed Racer” and “X-Men Origins: Wolverine.” Back in 1994, Stahelski doubled for Brandon Lee on “The Crow.” In 2008, he coordinated stunts on the set of “Rambo.” The pair also founded action-design company 87Eleven, which works with directors and stunt teams in pre- and post-production.

COMING UP: Set to direct their first feature in 2011, the team’s upcoming credits include “Conan” and “Tron: Legacy.” “We are known for transforming actors into action performers,” says Leitch. Adds Stahelski, “Designing an action sequence involves all your resources — cast, stunt team, camera, FX, etc.”

Merritt Yohnka
stunt coordinator

RECENT SCORES: The veteran stunt coordinator is a two-time Emmy winner for NBC’s action comedy series “Chuck.” His credits include the latest “Nightmare on Elm Street,” “Transformers” and “Rush Hour 3” as well as TV’s “Gossip Girl,” “Lost” and “The Shield.” “Stunts involve a lot of trust,” says Yohnka. “There’s a lot of training and a lot of practice, and it helps if you’re a great athlete, but ultimately you’re relying on each other to keep each other safe.”

COMING UP: Yohnka heads back to “Chuck” later this month.

Profiles written by Iain Blair, David Cohen, Peter Debruge, Jack Egan, Marjorie Galas, Karen Idelson, Chris Morris and Bruce Shutan.