Born in Windsor, Berkshire, and originally from Taplow, Buckinghamshire, she and her older brother Martin "moved around a lot" until they reached Norfolk. She had an unconventional, hippie, nomadic upbringing in the rural environs of Norfolk, as well as different parts of the Midlands and the Southeast. By her own account, her family "thought we were getting a new-built home, but it wasn't ready, and my mother, being as practical as ever, said: 'Well, we are homeless, so we are travellers until we are housed'. I remember trees, bushes and grass and a toilet in a shed. There was this enormous chrome caravan with those sort of lacy doily things in the window, and my birthday party in a tent, playing pass the parcel in the pouring rain. Rain is still my favourite weather". As a girl, her dreams were to become a dancer and prime minister, because she "liked the idea of being in charge".

Baker travelled widely as a teenager spending three years visiting France, Corsica, Italy, Greece and Switzerland, before ending up on Cape Clear, an island off the southern tip of Ireland, "because there was a ferry leaving to go there". She trained as a dancer at Bush Davies ballet school and left with six O-levels, but later abandoned A-levels in drama, English and History at Norwich City Tech for London.

Her initial career ambition was politics, inspired by her mother's environmental activism as well as her relationship with PR boss Matthew Freud, son of the ex-Liberal MP Sir Clement Freud, whom she met while working as a waitress in London. She said: "I got into it when I was 18. My boyfriend’s father was Clement Freud, and I used to help out. I loved it. Nicholas Parsons would be there stuffing envelopes, and I'd be out chatting to people.... Lewes District Council: Chair of the Council 2007 - 2008 It really suited me knocking on doors going "'Ello! How are you? How are things for you? Is your MP helpful? What could be better round here? Oh, I see what you mean ... Terrible state of the roads".

To supplement her modest income, Baker began glamour modeling as a Page Three girl at age 17 before she was discovered by noted erotic photographer, Byron Newman. When asked about what influenced her decision, she answered, "I really didn't have any problems about my body. It wasn't ever an ambition. It was just one of those things ... if you are a certain height with a certain look and a certain pneumatic silhouette ... sooner or later in that sort of company it's a bit inevitable really". She claimed that her comfort with posing nude was due to the liberating influence of her mother, Margaret Ayrton, a Witch. She said "I suppose being brought up by hippies as parents, I had absolutely no problem being naked. The problems I had were actually wrestling with the whole sort of feminist thing. I tried to justify it to myself that there were loads of jobs that I thought were equally demeaning because they had such a low wage. When I waitressed, my take home pay was what I could earn in two hours modelling". She attributes her buxom figure to ballet-training and having Irish and Welsh ancestry.

Baker was first approached to pose for Penthouse but turned them down and did her Playmate shoot in 1986 when she was 18. When the March 1987 issue of Playboy was released to newsstands she had only recently turned 19.

She was featured in several other men's magazines such as High Society and Gallery only a few months prior to her Playboy appearance. In 1995 Baker wrote a lengthy article about her experiences as a Playmate for the London edition of Time Out magazine.

An avowed bisexual and extrovert, she is given to cheeky, titillating remarks. For example, during her stay at the Playboy Mansion in 1987, she claimed to have had a lesbian affair with Hugh Hefner's then-girlfriend Carrie Leigh (Hefner was in the hospital recovering from a stroke at the time).

Baker has appeared in two films: the 1987 TV movie Casanova, starring Richard Chamberlain, and the 1990 short film Man from China. She also acted in the musical Forever Elvis (in the role of Priscilla Beaulieu Presley), and played Nina in a stage production of Chekov's The Seagull. By this time, she got involved in fighting chemical factories, ran a campsite with a cafe, worked on a goat farm, looked after a child and ran a community theatre.

Following the death of a boyfriend she retired from acting and modeling while still in her early twenties and for a brief time went back to waitressing in England. Back home, she decided to further her education and completed a BA in journalism from the London College of Printing and an MA in dramatic writing from the University of Sussex. She ended up doing work experience at the News of the World, before joining the London Evening Standard. During the 1990s, Baker worked extensively as a journalist, most often forThe Independent, The Telegraph and The Guardian newspapers, as well as Punch (where she was the Punch milkmaid), and Junior Magazine in the United Kingdom.

She is known today as a practising Wiccan and author of several children's books on Witchcraft, including Spells for the Witch in You ; Spells for Teenage Witches: Get Your Way with Magical Power ; Marina Baker's Teenage Survival Guide ; and Spells for Cats (the last was published under the name Daisy Pepper). In 2001, she worked as a magic consultant for a BBC documentary about the Harry Potter books.

Baker is active in local politics in the Lewes area of England, now working under her married name of Marina Pepper. She lives with her husband, Lee Pepper (whom she married at Cape Clear in 1997), and their two children, Charley and Boudicca ... the latter named in honour of her mother's pagan feminist beliefs and Norfolk origins.

She served in 2006 as Chairman of the Lewes district council, where she represented the coastal communities of East Saltdean and Telscombe Cliffs, just five miles east of the cosmopolitan hub of Brighton in Sussex. She lost her seat on May 3, 2007 when she was defeated for re-election by the Conservatives.

She has also served as the mayoress of Telscombe and during the 2005 General Election she stood (unsuccessfully) for Parliament in the Brighton Kemptown constituency as a Liberal Democrat. She has been quoted as saying, somewhat facetiously, "I'm not sure Page Three girls can become MPs".

Baker is active in a number of local environmentalist programs such as the Saltdean "walking bus", which accompanies a line of children to school, reducing the number of cars on the road and giving the children "a good bit of exercise" before school. She has also set up a community recycling scheme for a local preschool and ran eco-fairs to help promote understanding of sustainable living.

As a member of the Telscombe town council, she takes an active role in REGEN ... part of the Local Strategic Partnership ... where she organises projects to promote social economic and environmental well-being in the towns of Peacehaven, Telscombe and East Saltdean.

She organises regular REGEN events in the community, including "The Circle", a sustainability fair which has run in conjunction with Telscombe's Town fair, RANDOMfreeFEST ... a youth festival in Peacehaven ... and "Cool Yule", a seasonal market held at the beginning of the Christmas shopping season, promoting local food and gifts.