(written from a Production point of view)
Mary McCusker is the actress who appeared as a nurse in the Star Trek: The Next Generation episode "Evolution". Some filmed scenes with her were cut from the final aired episode, because of time's sake.
McCusker studied acting at the Boston Conservatory of Music, graduated from the Neighborhood Playhouse,  and started her acting career in the early '70s when she had guest roles in the television series Play for Today (1971, with Maurice Roëves). In the following years she had supporting roles in the comedy Tunnel Vision (1976, with Gerrit Graham and William Schallert), the comedy Cracking Up (1977, with Michael McKean and Leslie Ackerman), the thriller The Border (1979), and the television drama The Ordeal of Patty Hearst (1979, with Jonathan Banks and Star Trek voice casting agent Barbara Harris).
In the '80s, she portrayed guest roles in episodes of CHiPs (1980, with Robert Pine), Knight Rider (1983, with Patricia McPherson), Bay City Blues (1983, starring Michael Nouri), Remington Steele (1985, with William Frankfather and Harry Groener), Highway to Heaven (1984 and 1986, along Georgia Schmidt), and St. Elsewhere (1987, with Norman Lloyd, Ed Begley, Jr., and Bruce Greenwood).
Her feature film credits include Joel Schumacher's comedy The Incredible Shrinking Woman (1981, with Henry Gibson, John Glover, Betty McGuire, and David Ruprecht), the science fiction comedy Jekyll and Hyde... Together Again (1982, with Michael Ensign), the television drama Malice in Wonderland (1985, with Leslie Ackerman, Denise Crosby, Mark L. Taylor, Jason Wingreen and Anne Haney), and the comedy Turner & Hooch (1989, with Kenneth Tigar, Clyde Kusatsu, Nick Dimitri and Jim Beaver).
In the '90s, McCusker focused on her acting coach career and appeared in a handfull of productions, including Joel Schumacher's thriller The Client (1994), the drama The Cure (1995), the Doctor Finlay episode The Life of Men (1996), and the comedy Trojan War (1997, with Allan Graf and Jake Sakson).
McCusker has worked as acting and dialogue coach for several teenage and child actors such as Seth Adkins in ...First Do No Harm (1997), Malcolm Stumpf in The Next Best Thing (2000), and for the Jonas Brothers on the television pilot J.O.N.A.S! (2009). Other acting coach credits include the thriller The Client (1994), the comedy Operation Dumbo Drop (1995), the drama Tom & Huck (1995), the thriller Sleepers (1996), the comedies Paulie (1998) and Jane Austen's Mafia! (1998), and the television series Malcolm in the Middle (for seven years), The Bernie Mac Show, and Nip/ Tuck.