- He was Max VonSydow's standin and photo double during the filming of The Exorcist (1973) and actually spent more time working on the film (five months) than VonSydow did. In addition to standing in for VonSydow, Lackmann was placed in an over 100 degree "Heat box" to test Dick Smith's age makeup which VonSydow's was to use in the Iraq sequences at the beginning of the film (these scenes were filmed months after all U.S. filming had been completed). Lackmann was Father Merrin's corpse when Jason Miller pounded on that character's chest trying to revive him after his heart attack and his shadow and hands were also used during the filming.
- While in college in the 1950s, Lackmann played a character named Buddy on the popular radio soap opera series Pepper Young's Family.
- Biography/bibliography in: "Contemporary Authors". New Revision Series, Vol. 130, pp. 249-251. Farmington Hills, MI: Thomson Gale, 2005.
- Lackmann wrote a biography of radio/TV/film and stage actress Mercedes McCambridge, published in 2005 by Mc Farland Co., Inc and in that same year he also wrote Comic Strips to Radio, published by BearManor Media.
- Serving as a U. S. Army Broadcast and Personnel Specialist stationed at Fort Dix, New Jersey in 1958, Lackmann interviewed singer/actor Elvis Presley for W.F.D.H., for the Fort Dix Army hospital's Bedside Network, when Presley was en route to his Army assignment in Germany.
- Wrote numerous articles for Screen Greats and Afternoon TV magazines.
- Wrote numerous children's plays including Why the Indians Wear Moccasins, The Crooked Jar, The Obedient Daughters of Mitsuki Muri, for Plays, Inc. and The Grade Teacher magazines.
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