The Flash

Realizing he needed to harness Barry's speed to return to his own time Eobard begins devoting himself to ensuring Barry does indeed become the Flash, and traveled to Starling City to stalk Dr. Harrison Wells, the one who created the Flash via a particle accelerator. One month after killing Nora, Eobard caused Wells' car to crash, killing Tess Morgan and injuring Harrison, then drags Wells out of the car and uses a device to absorb Wells's DNA and literally make himself look exactly like Wells, intending to use the scientist's reputation and his own futuristic knowledge to create the particle accelerator as quickly as possible. After Harrison dies in the process, he buries Harrison's body in a field near the bridge and takes his place in the car as police find him.[4]
Life as Harrison Wells

After taking Wells' identity, Eobard subsequently devoted his life to S.T.A.R. Labs' creation and its particle accelerator as quickly as possible, but took precautions to ensure his plan would work and kept close observation throughout Barry's whole life by setting up cameras all over Central City even in the West house where Barry lived following Nora's death. He also inherited Wells' mansion but for security reasons he never kept any personal belongings in his house Eobard also came to like Big Belly Burger, even remarking it was one the few reasons to stay in the 21st century since cows are extinct in his time. After opening S.T.A.R. Labs, Eobard built a secret room accessible only via hand print where he kept the Gideon program which was still able to stay informed of future events, including a news paper article written by Iris titled "Flash Missing: Vanishes In Crisis" dated in 2024, an event currently set to occur in the new timeline. Eobard also kept his Reverse-Flash suit on a display case, and also stored a second suit away in the room. He also observed his nemesis's life including science fairs and soccer games, looking upon Barry with nothing but hate but would eventually begin to grow genuinely fond of Barry (15 years later would claim he didn't hate Barry, he hated but his future counterpart from the original timeline). Despite his new found fondness, he still vowed that Barry would die. He also kept just as close observation of his ancestor Eddie Thawne and took whatever precautions were needed to ensure Eddie would continue the Thawne family bloodline, thus ensuring Eobard's existence. Through Harrison's previous connections Eobard also became associated with Dr. Tina McGee, though Tina always sensed something was different about "Harrison". He also knew Simon Stagg who though famous for "his" scientific achievements, Eobard knew the greedy and corrupt philanthropist he really was. Eobard also once met Robert Queen at a charity event, one of their subjects of discussion was Robert's son Oliver. In his search for promising young minds to help with his work he became aware of Felicity Smoak and foresaw "great things" from her.
Harrison Wells and Hartley Rathaway playing a game of chess

Eobard playing a game of chess with Hartley Rathaway.

At some point Eobard hired Dr. Caitlin Snow, Ronnie Raymond and Hartley Rathaway, the latter of whom Eobard also grew close to and he became his prot?g?, to assist in the construction of the accelerator. It's possible he also hired them because of his future knowledge their achievements, later claiming that his actions have given them better lives than what they had.

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