Eve Plumb, the actress and painter most famous for playing the role of Jan on The Brady Bunch (1969), began acting professionally in 1966, appearing in TV commercials. The child actor began getting parts on series television in 1967. Her place in TV history was cemented when she landed the role of Jan Brady, the middle of three daughters in a mixed family that also featured three sons, in the TV sitcom "The Brady Bunch". The show, which debuted in 1969, ran for five seasons, through 1974 and spawned numerous spin-offs. While Plumb declined to…