Question: Who did the box cover art for Keith Martin to make Night Below?

Context paragraphs:
Night Below: Night Below: An Underdark Campaign, often known simply as Night Below, is a boxed set for the second edition of the "Advanced Dungeons & Dragons" fantasy role-playing game.  The set, with the product code TSR 1125, was published in 1995, and was written by Carl Sargent, with box cover art by Jeff Easley.

Keith Martin (heavy person): Keith Martin (1969 or 1970 – December 5, 2014), one of the world heaviest lived people, was famous for being at one point the UK’s heaviest man, weighing approximately 980 lbs at his peak.  Keith Martin was given a gastric bypass operation by the NHS, and had lost over 50% of his body weight.

Graphic Adventure Creator: Graphic Adventure Creator (often shortened to GAC) is a game creation system/programming language for adventure games published by Incentive Software, originally written on the Amstrad CPC by Sean Ellis, and then ported to other platforms by, amongst others, Brendan Kelly (Spectrum), Dave Kirby (BBC, Electron) and "The Kid" (Malcolm Hellon) (C64).  The pictures in the demo adventure, "Ransom", were made by Pete James and the box cover art by Pete Carter.

Gheos: Gheos is a tile-laying board game designed by René Wiersma.  Graphic design and illustration was supplied by Joshua Cappel, and box cover art was painted by Allan Bednar.  The game was published in 2006 by Z-Man Games.

The Ruins of Undermountain: The Ruins of Undermountain is a boxed set for the Forgotten Realms campaign setting for the second edition of the "Advanced Dungeons & Dragons" fantasy role-playing game.  The set, with product code TSR 1060, was published in 1991, and was written by Ed Greenwood, with box cover art by Brom.

Cover art: Cover art it is either an artwork as illustration or photograph on the outside of a published product such as a book (often on a dust jacket), magazine, newspaper (tabloid), comic book, video game (box art), DVD, CD, videotape, or music album (album art).  The art has a primarily commercial function, i.e., to promote the product it is displayed on, but can also have an aesthetic function, and may be artistically connected to the product, such as with art by the creator of the product.     Scribes and typographers (today’s cover artists), like architects, have been shaping visual spaces for countless years.  Certain proportions keep recurring in their work because they please the eye and the mind, just as certain sizes keep recurring because they are comfortable to the hand.   Even the Web benefits.    For too long typographic style and its accompanying attention to detail have been overlooked by website designers... In years gone by this could have been put down to the technology, but now the web has caught up.   Cover art not only sells, but enhances function, form and content of published works.

Let Me Take Control: Let Me Take Control is a Keith Martin album released on 13 August 2007 by Galaxy Records.  The song "Lady" was released as the first single.  This album is Martin's third Filipino album.

To Be Continued... (box set): To Be Continued... is a four-disc box set detailing Elton John's music from his days with Bluesology to the then-present day.  Four new songs ("Made for Me", "You Gotta Love Someone", "I Swear I Heard the Night Talkin'" and "Easier to Walk Away") were recorded for the box set.  Newly sober John was unhappy with the US cover art (it reminded him of his old excesses), so the 1991 UK release was issued with new cover art and also replaced "You Gotta Love Someone" (which had already been released on "The Very Best of Elton John" the previous year) and "I Swear I Heard the Night Talkin'" with then-unreleased "Suit of Wolves" and "Understanding Women", the former a B-side to "The One" and the latter later included as a track on the 1992 album "The One".  In the US, it was certified gold in June 1992 and platinum in November 2006.  In April 2016 it was certified 2 x platinum by the RIAA.

Carl Sargent: Carl L. Sargent (born December 11, 1952, in Caerleon, Monmouthshire, Wales) is a British parapsychologist and author of several roleplaying game-based products and novels, using the pen name Keith Martin to write Fighting Fantasy gamebooks.

Nick Egan: Nick Egan (born July 4, 1957 in London, England) is a visual design artist, and director of music videos, commercials and film.  He graduated from the Watford College of Art and Design with a DGA in 1976.  While attending college, he created cover art for the singles "White Man In Hammersmith Palais" and "Tommy Gun" for The Clash and T-shirt design for the single "Sheena is A Punk Rocker" for The Ramones.  His first chart topping album cover was Dexys Midnight Runners' 'Searching For The Young Soul Rebels'.  He collaborated with former Sex Pistols manager and fashion entrepreneur Mr. Malcolm McLaren, for whom he designed the album cover for Bow Wow Wow's 'See Jungle'.  His longtime partnership with McLaren McLaren led the art direction of McLaren's own inventive albums; Duck Rock and 'Fans'.  Egan relocated from Britain to New York, where he created cover art for legendary artists like Bob Dylan and Iggy Pop.  Egan also art directed books; John Lennon "Listen To These Pictures" by Rock-n-Roll photographer Bob Gruen and Bob Dylan's "Drawn Blank".

Supporting paragraphs: Night Below Carl Sargent
Answer: Jeff Easley