Horsfield quit football to fight testicular cancer before returning when he was given the all-clear.
Horsfield sees Saturday's derby as a chance to kick-start their season and regain their top spot.
Dejan Stefanovic could only deflect a Zoltan Gera cross and Horsfield struck at the far post.
BBC: SPORT | Football | Premiership | West Brom 2-0 Portsmouth
Richardson doubled the Baggies' lead, collecting Horsfield's backheel and drilling the ball past Ashdown from 10 yards.
BBC: SPORT | Football | Premiership | West Brom 2-0 Portsmouth
Alan Horsfield, a stonemason at St Paul's, is appointed MBE, as is Kiss 100's reggae DJ David Rodigan.
Alan Neilson and Sean Davis are also fit again but Geoff Horsfield and Rufus Brevett are both injured.
Assistant manager Geoff Horsfield has not been offered a playing contract, but will remain on the coaching staff.
Horsfield insists the team cannot risk picking up any red cards in the first derby game of the season.
He pushed Horsfield up front alongside Kanu, turning a 4-5-1 into a 4-4-2.
Dr Horsfield's research centres on demonstrating how the vibration might be detected.
The Hawthorns erupted when Horsfield beat Ashdown with a volley on the turn just minutes after arriving as a substitute.
BBC: SPORT | Football | Premiership | West Brom 2-0 Portsmouth
As time ran out, West Brom looked set to snatch a point as Horsfield rolled a cross into the area.
BBC: SPORT | Football | Premiership | West Brom 1-2 Middlesbrough
Robson made a surprising double substitution on the hour, replacing Zoltan Gera and Earnshaw with Geoff Horsfield and Rob Hulse.
BBC: SPORT | Football | Premiership | West Brom 1-2 Middlesbrough
Horsfield signed a one-year contract with Port Vale on Tuesday and will work at Vale Park as number two to manager Micky Adams.
And Horsfield, who beat cancer to return to league football with Vale last summer, hopes to be involved when Macclesfield visit Vale Park on 23 January.
Dr Horsfield and his collaborators have demonstrated nanowires - wires just billionths of a metre across - that can act as the "room" of the analogy.
"There's still lots to understand, but the idea that it cannot possibly be right is no longer tenable really, " said Andrew Horsfield of Imperial College London.
Former Fulham and Birmingham striker Horsfield started the first match of the campaign against Rochdale, but was then limited to sporadic substitute appearances because of injury problems.
Horsfield made his name in the 1997-98 season when he scored 30 goals in 40 games to help Halifax into the Football League, whilst still working part-time as a bricklayer.
Despite not being offered a playing contract, Adams confirmed Horsfield is likely to remain registered as a player next season, although he would only be called upon in an emergency.
Dave Horsfield from Liverpool Primary Care Trust (PCT), which is working with Liverpool FC on men's health projects, says men are particularly bad at doing something about improving their health.
Horsfield and Yip, who hails from Hong Kong but was educated at Harvard, also own another 21 beds further toward the top of Moganshan at what they call naked Home Village.
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Horsfield has made no secret of his desire to become a manager in the future and Adams wants to give him the chance to further develop his coaching skills at Vale Park.
Caretaker managers Geoff Horsfield and Mark Grew achieved their first victory in charge of Vale, a 2-1 success against Burton Albion on Monday, to strengthen their grip on fourth position in League Two.
Coaches Geoff Horsfield and Mark Grew have been placed in temporary charge for the trip to Rotherham on New Year's Day as second-placed Vale look to bounce back from two successive League Two defeats.
Horsfield arrived at Vale Park in July 2009, but a series of injuries have limited him to just one start for the club, which came on the opening day of the season against Rochdale.
Former Fulham, Birmingham City and West Bromwich Albion striker Horsfield has made almost 400 appearances, scoring 126 goals, since making his name by firing Halifax Town back into the Football League in 1998 at the age of 25.
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