(written from a Production point of view)
Danny Goldring (born 31 May 1946; age 71) is a stage, television, and film actor who made guest appearances in three of the Star Trek spin-off series. He appeared in a total of six episodes, playing five different characters. For the Star Trek: Enterprise second season episode "The Catwalk", Goldring filmed his scenes in late October 2002 on Paramount Stage 18. His uniform from this episode was later sold off on the It's A Wrap! sale and auction on eBay. 
Goldring was born in Woodstock, New York. As the son of a US Navy officer he traveled the world until he settled down in Chicago, Illinois. After he toured with the puppeteer troupe Cole Marionettes, Goldring attended the Goodman Theatre School of Drama to focus on a career as an actor. 
Goldring has started his screen career in the 1970s with appearances in the television crime drama The Million Dollar Rip-Off (1976, with James Sloyan and directed by Alexander Singer) and guest roles in episodes of The Awakening Land (1978, with Bert Remsen and Timothy Carhart), Texas (1980), and Crime Story (1986, with Bill Smitrovich, William O. Campbell, Linda Fetters, and Michael Krawic).
Further television work includes the series Dallas (1989, with Leslie Bevis and Joshua Harris), Matlock (1989, with Brooke Bundy, Michael Durrell, David Froman, Jason Wingreen, and Mark Chaet), Hunter (1990, with Charles Hallahan, Tony Plana, Brooke Bundy, and Tina Lifford), ABC Afterschool Specials (1993), Missing Persons (1993, with Kavi Raz and James Otis), Renegade (1994, starring Branscombe Richmond and with Judson Scott, and Joseph Campanella), VR.5 (1995, with Louise Fletcher, Erick Avari, and Tom Towles), NYPD Blue (1995, with Sharon Lawrence, Gordon Clapp, Michael Rothhaar, Deborah Taylor, and Herschel Sparber), Wings (1995, with Steven Weber, Andrew Robinson, and Tucker Smallwood), Space: Above and Beyond (1995, starring Lanei Chapman and Tucker Smallwood), ER (1995, with Tony Plana, Mike Genovese, and Lily Mariye), EZ Streets (1996, with Mike Starr and Nichole McAuley), Nothing Sacred (1998, with Mark Harelik, Cindy Katz, and James Harper), Turks (1999, with Cindy Katz and Ernest Perry, Jr.), The Practice (1999, with Stephen Macht, Ann Gillespie, and Saul Rubinek), and Early Edition (1998 and 2000).
Film work includes the fantasy comedy Vice Versa (1988, with Charles Lucia and Peggy Roeder), the action film Above the Law (1988, with Thalmus Rasulala), the action drama The Package (1989, with Joanna Cassidy, Thalmus Rasulala, and Dennis Cockrum), the television crime drama Johnny Ryan (1990, with Clancy Brown and Cameron Thor), the sport drama The Babe (1992, with James Cromwell, Bernard Kates, Michael McGrady, Shannon Cochran, Michael Papajohn, Larry Cedar, Ken Gildin, Harry Hutchinson, Michael Krawic, Scott Haven, Kara Zediker, and Nick Satriano), the television thriller Legacy of Lies (1992), the unsold television pilot Angel Street (1992, with Michael Cavanaugh and Mark Rolston), the television thriller In the Company of Darkness (1993, with Steven Weber and Peggy Roeder), the action film Excessive Force (1993, with Tony Todd, Tony Epper, Bobby Bass, Tom Hodges, Mario Roberts, and Carl Ciarfalio), the thriller The Fugitive (1993, with Andreas Katsulas, Daniel Roebuck, Richard Riehle, Pancho Demmings, and Jim Wilkey), the crime drama Natural Born Killers (1994, with Richard Lineback and Carl Ciarfalio), the science fiction thriller Virtuosity (1995, with Louise Fletcher, Michael Buchman Silver, Rogan Wilde, and Tracee Cocco), the science fiction film Chain Reaction (1996, with Joanna Cassidy and Tzi Ma), the comedy Bean (1997, with Harris Yulin, Larry Drake, Dakin Matthews, April Grace, David Doty, Robert Curtis Brown, and Annette Helde), the television drama Always Outnumbered (1998, with Bill Cobbs and John Cothran, Jr.), the crime comedy Goodbye Lover (1998, with John Neville, Michael Krawic, John Prosky, Rob LaBelle, and Leslie Jordan), and the horror sequel Children of the Corn V: Fields of Terror (1998, with Fred Williamson, Kane Hodder, Hiro Koda, and Deborah Strang).
In the more recent years, Goldring guest starred in The Invisible Man (2001, with Armin Shimerman and Gary Weeks) and Six Feet Under (2005, with James Cromwell, Joanna Cassidy, Lisa Banes, Rosalind Chao, and Andy Milder), appeared in the short projects Janey Van Winkle (2002), A Perfect Manhattan (2009), and Lenny Morris vs. The Universe (2011), and worked on the science fiction comedy Just Visiting (2001, with Malcolm McDowell, Darryl Henriques, Ric Sarabia, and Kelsey Grammer), the science fiction film Betaville (2001), the drama The Earl (2007), and the crime drama Chicago Overcoat (2009, with Mike Starr and Usman Ally).
In 2008, Goldring played "Grumpy", one of Joker's goons in the comic adaptation The Dark Knight. He filmed his scenes for eight days in Chicago and wasn't seen without a mask in this movie. Goldring remarked that, "You might recognize my voice."  The film also featured Star Trek alumni Keith Szarabajka, Tommy "Tiny" Lister, Jr., Andrew Bicknell, Jon Lee Brody, and Tom McComas.
Between 2011 and 2012, Goldring portrayed Ryan Kavanaugh in the two seasons of the crime television series Boss, starring Kelsey Grammer and with recurring guest stars Francis Guinan and Nicole Forester.  Goldring also performed in various stage plays such as "King of Coons", "Under Milkwood", "One Flew Over the Cuckoo's Nest", and "Porgy and Bess". 
More recently, he appeared in the thriller The Drunk (2014, co-produced by Chadwick Struck), the fantasy thriller Dig Two Graves (2014, with Kara Zediker), two episodes of the Netflix series Sense8 (2015, with Ness Bautista and created and executive produced by J. Michael Straczynski), the television comedy Cop Drama (2015), and the comedy Fools (2016). Currently in pre-production is the short comedy When Jeff Tried to Save the World (2017, with Him O'Heir).