A seasoned financial analyst and tech enthusiast with over a decade of experience in market strategy and digital transformation.
Key points
The dominant Edinburgh side surged eight ahead of Celtic at the top of the Scottish top flight to bolster their early title credentials and worsen the struggles around Brendan Rodgers' side.
A superb goal from Kyziridis and Lawrence Shankland's penalty gave the Hearts team a two-goal advantage that the title holders could not recover from.
The young defender - among three youth players in the Celtic XI - slashed into his own net early on to put the home side ahead at a energetic Tynecastle, and it was the 22-year-old's foul that led to the spot-kick.
A stylish finish from McGregor of the season had swiftly equalized Hearts' opener, and Benjamin Nygren almost put Celtic in front, choosing placement over power and allowing Alexander Schwolow to make a crucial stop.
But the unstoppable Hearts side seized control again to consign the visitors to back-to-back losses for the first time since last year.
It also gives the Edinburgh side a commanding advantage at the summit.
The previous occasion they were this far ahead was in 2005-06 under their former manager, when they ultimately finished second - one of just four occasions that a team has failed to win the title after building such an advantage in the last three decades.
The Hearts coach, whose Aberdeen side were second to Celtic on multiple times, has been working hard to downplay title talk, as the club seek their first top-flight crown since 1960.
Rodgers has experienced this previously at Celtic - both flawless and stuttering starts to a season. He's never ended as runner-up.
But on Sunday's evidence, this Edinburgh outfit showed they need to be taken seriously.
Hearts started with the self-assurance of a side undefeated in the league this season - the popular attacker poked a cross in for the striker to stab wide.
Celtic didn't help themselves with some unusual sloppiness in possession and they buckled under their initial test.
A headed effort from Braga was touched on to a post by Kasper Schmeichel and the follow-up from Shankland was turned into the net by the hapless defender, in for the injured Cameron Carter-Vickers.
Celtic grew into the contest and started stringing passes together. From one such move, Sebastian Tounekti released Tierney to square for the captain, who rolled in.
Aside from the Nygren chance, the visitors found it hard to generate chances for striker Kenny or his replacement Shin Yamada amid the unavailability of injured forwards Kelechi Iheanacho and Daizen Maeda.
Hearts rediscovered their energy and adaptability in creating chances in the opposition half. The Greek forward, one of the finds of the club's relationship with shareholder Tony Bloom's Jamestown Analytics, struck low past the goalkeeper from the just outside the area.
Almost straight away, the defender tripped the midfielder in the inside right channel and Shankland scored. And it could've been an more comprehensive victory, had replacement Ageu not been denied by Schmeichel.
The visitors' performance after the break was partially encapsulated in a couple of moments involving record signing Arne Engles.
The set-piece from Engles delivery was in stark contrast to his midweek exploits in the continental victory over Sturm Graz and the national team player was then booked for a cynical foul.
Hearts head coach Derek McInnes: "The effort from the squad is evident, the togetherness. That's not always enough to win games consistently.
"Our strength lies in, is good technical ability. You're witnessing it from multiple individuals who have been here before. Recent additions are eager to show that.
"We've got a good thing going at the minute, but it's just one win. It's important for us to maintain this form. We've got much work ahead, plenty to improve. After the first two rounds is normally an indication of your standing."
Celtic manager Brendan Rodgers: "The second goal was disappointing from our perspective. We failed to push up when the ball went back as a line so when they play it, they should have players offside but didn't. We have got to do better with the shot.
"There's still so many points to play for. It's only the beginning. It's just nine matches. Clearly, being eight adrift is not what we would want. The comfort is there's so many games to play.
"Our attention must turn on the here and now and look to find more consistency and better performance in our play."
Celtic are returning to their stadium on midweek against newly-promoted Falkirk (evening kick-off). At the same time in the Scottish Premiership, the Edinburgh outfit are at their opponents' ground.
A seasoned financial analyst and tech enthusiast with over a decade of experience in market strategy and digital transformation.