As you can see, Nev has a lot of different skills, in many different disciplines. That is because Nev's career has changed course so many times, pursuing multiple types of goals, that he is now fairly well skilled for almost anything, but not yet ultimately trained in any one particular discipline.
Neville began as a simple miner, eager to earn ISK by lasing asteroids in his Navitas, which was the Gallente mining frigate at the time. Mining wasn't glamorous, but it was an honest way to earn funds, and there was some potential for growth. He trained for barges and exhumers, and eventually piloted a Hulk to gather ore and a Mackinaw to harvest ice. But I soon realized that Nev needed to get perfect refine status to maximize earnings from mining, so he trained refining skills (now called Resource Processing). But that wasn't enough - he also needed standings with certain corps to lower refining costs. And so, Nev became a mission-runner.
That forced Nev to start training spaceship command skills, core ship fitting skills, and also navigation, gunnery and drones skills. He worked his way up from Level 1 to Level 4 missions, training from frigates to cruisers to battlecruisers to battleships. He also trained Social skills, to make the rewards for missions more lucrative.
Neville soon became proficient at knocking down Level 4 missions in a Dominix, but I had my eye on the obviously superior Rattlesnake, and so began Nev's cross-training of Ship Command skills. And once I had my 'Snake in my hangar, I quickly realized I had to train Missile and Shield skills to make the most of that ship.
And so it has gone, throughout Neville's career - bouncing from one objective to the next, opening up option after option in EVE Online. I wish I could say I had a long-term plan, but that would be a gross exaggeration. At one point, I had sixteen different skill plans stored in EVEMon, waiting for the current queue to finish. I wanted to try everything, but that meant never focusing too long on any one thing.