Question: Name the songwriter from San Francisco who operates the Art of Ears Studio and who worked with the lead vocalist for the hip hop group Digital Underground?
Context: Playwutchyalike: The Best of Digital Underground is the second compilation album from rap group Digital Underground. Dante Ross (born October 11, 1965 in San Francisco, California) is an American music industry executive, A&R representative, and producer.  He was named one of the top-25 greatest A&R representatives in hip hop by "Complex" magazine.  Ross started his A&R career at Tommy Boy records, at which he signed and handled the careers of such artists as De La Soul, Queen Latifah, and Digital Underground.  Ross was then hired by Elektra Records and was the first person ever hired by a major label to be specifically a hip hop A and R man.  Ross became the architect of Elektra Records hip hop roster where he signed acts Brand Nubian, Grand Puba, Pete Rock & C.L Smooth, KMD, Leaders of the New School, Busta Rhymes and Ol’ Dirty Bastard.  He is currently a SVP of A&R ADA Music the independent distribution company owned by the Warner Music Group.  He also serves as SVP of A and R for the newly re-activated Asylum records. Sex Packets is the debut studio album by American hip hop group Digital Underground, released on  20, 1990 (1990--) .  It is a concept album about "G.S.R.A." (Genetic Suppression Relief Antidotes), a pharmaceutical substance that is produced in the form of a large glowing pill about the size of a quarter, which comes in a condom-sized package and is allegedly developed by the government to provide its intended users such as astronauts with a satisfying sexual experience in situations where the normal attainment of such experiences would be counter-productive to the mission at hand. Mandolyn Wind Ludlum (born  1974–75 ), better known by her stage name Mystic, is an American hip hop artist from the San Francisco Bay Area.  After touring and recording with Digital Underground she released her debut solo album in 2001. Live from the Styleetron is the debut studio album by Oakland-based hip hop group Raw Fusion.  The group was fronted by Ron Brooks, known as Money-B, an active member of Digital Underground who produced this album as a side project with fellow group member David Elliot known as DJ FUZE.  Among many featured artists was a young unknown performer named Tupac Shakur who would later become a legendary figure in the world of hip hop. Andy "Andro" Ernst is a music producer, engineer, musician, and songwriter from San Francisco.  Artists he has worked with include: Green Day, AFI, Sway & King Tech, Rancid, Tiger Army, The Nerve Agents, Malo, Link 80, Screeching Weasel, Swingin' Utters, Screw 32, Good Riddance, Fury 66, Shock G and Money B.  The majority of his work has been punk rock.  Ernst owns and operates the Art of Ears Studio in Hayward, California, previously located in San Francisco. Gregory Jacobs, commonly known by his stage name Shock G (as well as by his alter ego Humpty Hump) is an American musician and rapper, known as the lead vocalist for the hip hop group Digital Underground.  He is responsible for Digital Underground's "The Humpty Dance", 2Pac's breakthrough single "I Get Around", and co-producer of 2Pac's debut album "2Pacalypse Now". Raw Fusion was a spin-off project from Digital Underground emcee Money-B, with DJ talent provided by DU contributor DJ Fuze.  Their albums contained cameos by many of the Digital Underground crew, including Shock G (as himself, Humpty Hump, and the Piano Man) and 2Pac.  The group gave a more raw, hardcore feel than the funky styles that typical Digital Underground albums projected, pulling away from their Funkadelic and Parliament roots.  Tracks put out under the Raw Fusion name tended to be more experiemntal and had less of the flow that was typically found in other tracks to which Money-B and DJ Fuze had contributed.  The group released two albums before disbanding. The Body-Hat Syndrome is the third album from the rap group Digital Underground, on which they continued to cultivate their own brand of P-Funk culture, ending more than a year of silence with a fresh batch of funk-infused rap.  With the edgy grind of the leading single, "The Return of the Crazy One", and its accompanying X-rated video (reworked for public consumption) boosting the band back into the spotlight, the rest of the album unfurled to less than outstanding crossover commercial acclaim.  The album's second single, an anti-racism cultural awareness politico called "Wussup Wit the Luv", featured an inspired solo from the Funkadelic guitarist Michael Hampton, as well as a verse and video appearance by Tupac Shakur.  This was the last time Shakur appeared on any Digital Underground release, while the lead rappers Saafir and Clee were added to the line up. Sons of the P is the second album by American rap group Digital Underground, released on October 15, 1991.  The album featured two hit singles, "No Nose Job" and "Kiss You Back", both of which were written by, and featured the lead vocals of Greg Jacobs (a.k.a. Shock G/Humpty Hump), and the latter of which featured multi-layered choruses and background vocals sung by Boni Boyer, who briefly worked with D.U. shortly after her stint with Prince's Sign of the Times/Love Sexy band.  It is sometimes mistakenly reported that Kiss You Back was co-written & co-performed by George Clinton, but his name appropriately appears in the writers credit due to a sample of "(Not Just) Knee Deep" by Funkadelic.  He did however actively participate in the writing and recording of the title track "Sons of the P", to which he also contributed vocals, and which marked one of the earliest studio guest appearances by Clinton on a Hip Hop release, preceded only by Kurtis Blow's "Magilla Gorilla" released in 1986.  Both the album and the single "Kiss You Back" were each certified Gold by the RIAA.
Answer: Andy "Andro" Ernst