CORRECTION:  This story originally misreported the date of Grant Russum's accident, and misstated the length of time he was in critical condition.

Within the past year, 21-year-old University of Colorado student Grant Russum has dedicated his studies to bio-engineering, appeared in a documentary about an Olympic snowboarder and climbed two fourteeners. Plus, he'll soon embark on a trip with his youth group to work at an orphanage in Mexico.

That's a great deal of accomplishment for anyone, but especially for someone who only two years ago was re-learning how to walk.

On Sept. 27, 2011, Russum suffered life-threatening head injuries after being hit by a pickup truck driven by a fellow CU student while he was crossing Regent Drive near Kittredge Loop.

The driver reported his vision was impaired by the sun and was not ticketed; Russum was not using a crosswalk when the accident occurred.

Russum was in a coma at Boulder Community Hospital for three weeks and improved to serious condition that October. He was moved to Craig Hospital in Englewood, where much of his rehabilitation took place. he spent six weeks in critical condition.

"He was there for almost five months. He actually got invited to the annual Craig Hospital foundation fundraiser this year, and he will be going up and presenting on stage," said David Russum, Grant's father.

During his time at Craig Hospital, Grant Russum ended up in the documentary "The Crash Reel," which focuses on professional snowboarder Kevin Pearce as he recovers from a serious injury.

"Grant got his 20 seconds of fame when he's wheeled out in front of the camera just as he got his skull back together," David Russum said.

Grant Russum continued recovering in Texas, where his family lives, but he couldn't shake the visions of the Flatirons from his brain. He wanted to return to school at CU.

"He's really made Colorado his home," David Russum said.

In the fall of 2012, Grant Russum enrolled in community college in Texas to try to get himself on track to return. In January of 2013, he made his comeback, "probably a little sooner than he was ready for," his father said.

Although he is now finished with rehabilitation, his father said Grant Russum still has some trials.

"He still has some minor balance issues. His walking looks a little mechanical. Sometimes his speech is slurred. His biggest issue is if he's fatigued, everything is very pronounced," David Russum said.

'I was studying a lot'

Grant Russum enrolled in a couple classes that spring semester and found himself struggling with the new college lifestyle. David Russum said that social integration since the accident has been his son's biggest struggle, and Grant Russum added that the amount of time it takes him to study and stay on course with school takes away from his social life.

"Social issues have been the most significant struggle since returning, even over physical struggles," Grant Russum said. "I'm an extremely social person, but my chemical and biological engineering major has not been allowing me to do much socializing. I would have joined a buddy's fraternity, but I was studying a lot."

Unable to part with the place he felt most at home, Grant Russum stayed in Colorado for the summer of 2013. He took one summer school course and did some more cognitive rehabilitation. In true Colorado fashion, he climbed two fourteeners that summer: Quandary Peak and Mount Bierstadt.

Grant Russum said he loves exercising as a form of stress relief, and the challenge of the mountains intrigued him.

"The first time up, he had some balance issues, but he had the strength to do it. His balance continues to slowly improve," David Russum said.

In the fall of 2013, Grant Russum took on three more courses at CU, but he found that was a bit too much for him to handle and dropped down to two courses this spring semester. He has accumulated the credits to have a sophomore's standing.

"I'm taking a much lighter load than a regular student could because that's all I can really stand currently," he said. "I've been told by my neurologist that it will improve over time. Other than that, I'm just studying constantly to attempt to keep up."

Studying is likely to be a constant in Grant Russum's life, as the accident has set his sights on a new career goal: medicine.

He said he's always loved helping people, but the accident showed him how much a good doctor or nurse can improve a person's life.

"I'm looking to go into the medical field," he said. "I'd like to get involved with anything that combines medicine and social aspects. My ideal job would be a pediatrician because I love kids, and kids love me, for some reason."

'Whatever they need is done'

Grant Russum's love of helping will soon be put into action. Next month, he will be travelling to Mexico with his Young Life youth group in order to help out at an orphanage.

"He's always been very good with people and working with people. When we talked about engineering and working in a cubicle, he was really turned off by that," his father said.

Grant Russum confirms his affinity for hospitality and adds that if it weren't for the help his family and friends gave him, he might not be alive today.

"I would not be in the position I am today without any of their help," he said. "They have just been pretty much the backbone and more. It's insane how much they've gone through for me, and I truly appreciate that. I will do whatever it takes to repay them. Whatever they need is done."

David Russum said everyone is so proud of his son for maintaining a positive attitude through all of his hardships and progress.

Grant Russum's progress has amazed even himself.

"I have photos of myself from right after the accident, and I'm just sitting there thinking, 'Oh my God, I looked like that?" I didn't think I could come this far. I feel quite good."